What will you use this computer for? If gaming/gpu heavy applications then both 450 and 5770 will be HUGE bottlenecks for this machine. I strongly suggest you get a completely different build with more concetration on the gfx card.
If you still want your 5770 or gts450, 5770 will give you a abit more performance over the 450 w/o overclocking.
neweegg.com, you pick your parts and build it yourself, building a pc is very easy, and the motherboard and other components usually come with good documentation explaining step by step how to install it all, also you can check youtube if you want video of how to install compoonents from the motherboard and cpu to the rma and video card, its all eay and 1100 will build you a much better pc than you will be able to buy
also its the new intel chips that should be coming out in Q1 (1st quarter) 2011
they are not going to be thier high performance chips though (supposedly... no benchmarks yet to confirm) so as it looks like you're already planning on an i7 you should be fine to go ahead with an i7 build
Yes this would be for gaming. At the moment I use 1280x1024 with medium settings, which isn't bad but I'd like to go at least 1680x1050 on somewhat higher settings. My monitor's native is 1920x1080.
Regardless of how I get the computer I'd like to spend about $1100 at the most.
For building my own computer.. Could any of you suggest a good website to do so at?
I'd say use your native resolution. Then step up to the gts460 1gb / 6850 level of graphics cards.
But if you'll stick with your 5770/gts450, get this one: http://www.galaxytech.com/en/productview.aspx?id=355 That's the fastest gts450 in the market right now afaik. 5770 is still faster than gts450 reference vs reference but that card is factory oc'ed to 1ghz, so i guess it would beat most, if not all 5770s out there.
I agree on waiting for the new Intel chips. They should be out in about 2 weeks. I also recommend signing up for Newegg's email list. They have very frequent sales you should keep an eye on. When you spot a good deal on a component that is right for your build go for it and keep an eye out for combos as well. With $1000 to spend you should be able to build something very nice.