It's always a good sign when people understand/read my wall of text posts

. Good luck gathering parts and if you have any other questions please ask. I (or someone else I'm sure) will try to help. Also, when you've got a list together, post it so we can double check compatability and stuff (no one wants to start building a system and then notice that something doesn't fit).
Oh, and as for brands:
Motherboards:
- ASUS: The only manufacturer that really matters in my (and many people's) opinion. They absolutely dominate the market and deserve to. Unlike many they build for both AMD and Intel sockets and since they have been doing so for such a long time, they have an absolutely ridiculous portfolio of boards available. You can literally find a board for any budget and you'll still be impressed.
- MSI: I have never used one however I have always heard great things about them. They are very solid but since they can't compete with the massive market that ASUS has developed their boards do not span every budget. You'll still find quality, but it may be difficult to find certain features for certain prices.
- Gigabyte: A decent manufacturer and currently the only builder of the XL-ATX board designed for stupid amounts of expansion. My only issue with them is that their boards are always some wacky neon color or something which simply does not fit with my sleek builds.
Power Supplies:
- Corsair: They jumped into the PSU game recently (or at least with a lot of products) and have already managed to grab quite a few titles for PSU development. Of course I will be biased towards them since they have never done me wrong but they have reasonably priced components spanning many wattages and forms. Also, since it's Corsair, they all come with nice warranties and the nice shiny ones (high wattage/modular) will come with lifetimes.
- Antec: The best for a very long time. Their PSU's you'll notice to be very cheap compared to others but trust me when I say they are quality work. They also have a larger market than Corsair so you can definitely find some oddball wattages if you need to.
- Ultra: First to get into the modular game and they are definitely nice looking. However, I have heard that they have a noticeable failure rate and I think they know this since if you register your PSU online you will get a lifetime warranty. But to be honest, I'd really not like to use a warranty on a PSU, since the last thing I want is a giant box of electricity to break in my expensive system.
ATI Graphics Cards:
- XFX: They used to be only decent but now that most cards (of the same number) are the same price, you definitely can't beat their instant lifetime warranty. I mean, the last thing you want is for your $300 5850 to go up in smoke after a year of heavy gaming. As I mentioned before, in the current market, you're buying warranties.
- Sapphire: The only other manufacturer I would recommend. They are also the only manufacturer that you'll notice to price their cards higher than others. This is because they clock their cards slightly higher than the factory default settings. To be honest though, if you want to do that you can simply clock it yourself. The hardware is the same though so you could clock any card up to their frequency and save the money. Once again though, great quality here but I'd still go for the better warranty.
Hard Drives:
- Western Digital: The only drives I will ever buy...ever. I have used many brands (which I will list) but nothing feels as reliable as a good old WD. They may be slightly more expensive (hardly) but they are worth it. For ~$10 extra (compared to similar sized WD drives) you can get the Black version which comes with a nice 5 year warranty that I doubt you will ever need to use. The usual lifespan of a HDD is supposed to be a little over a year. My server has 2 in it and it's been cranking for 4.
- Seagate: Don't. They only exist for their overpriced 15k RPM Data Center drives. Otherwise their normal stuff has probably the highest failure rate of any drive manufacturer. My old server has 3 500 GB's in it (2 WD, 1 Seagate) and they're sitting in a RAID 0 array. It's been running fine for about 2 years now but it does get loud and it does get hot compared to the others. I'm currently ordering a triplet of WD 1TB's so I can completely ditch the thing before it blows up. Yes, their $50 1TB drives may look nice, but in the HDD market, you get what you pay for.
- Maxtor: If you want to live in what sounds like a wind tunnel, get a few. I think that speaks for itself.
- Hitachi: Probably my second choice if all the WD hard drives in the world disappeard. My friend runs them in his server farm and if they're good enough for him they're good enough for me. He also endorses WD but his company gets good prices with Hitachi.
Memory:
- When I get home since I'm at work typing this

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tl;dr: Corsair >= Kingston > OCZ
-x1