Hey, first of all, if you could get good used ones(used by gamers) in either craigslist or ebay, go for it. I got mine used for $200 and mines at 800kh/s. And also just buy powered extender cables to manage heat and excess current on the board.
GPUs good to use:
5970 - 800 Kh/s
6990 - 800 Kh/s
7950 - 780 Kh/s
R290x (obviously it's brand new) - 800+ Kh/s
And get a good PSU. Don't mind the power bills, because if you do, it would be late to have one and difficulty on most coins will soar.
P.S.
You could resell those stuffs to some gamers later(at the same price you got them).
GPUs good to use:
5970 - 800 Kh/s
6990 - 800 Kh/s
7950 - 780 Kh/s
R290x (obviously it's brand new) - 800+ Kh/s
And get a good PSU. Don't mind the power bills, because if you do, it would be late to have one and difficulty on most coins will soar.
P.S.
You could resell those stuffs to some gamers later(at the same price you got them).
This makes no sense. The KHs numbers are way off. Like I said before you really need to do alot of your own research. You can find all the answers here or on other boards. Even if somebody tells you what you want to know you will be right back here when you are trying to build or tune your rig because you wont have read anything. So its either read on your own and be able to find the answers to your questions (you will have many even if you buy a rig already built) or ask and wait for a response every time you have a question.
For general Scrypt GPU specs/speeds/etc go here.
https://litecoin.info/Mining_hardware_comparison#AMD_.28ATI.29
Do realize that some people exaggerate theyre speeds though.
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Dont mind the power bills?
Um yea if you end up spending $350 a month in electric and only get $250 a month in coins then you should just buy coins instead of pay $1200 a year for nothing. So please DO mind the power bills.