I thought you would have more experience with the specific info. but meh. How much would a 1ghash dedicated miner cost anyway?
depends if you mind buying used etc.
A dedicated miner, IMO, should at least have 2* 5970 or 6990s, but IMO, a dedicated miner should be 4* 5970 or 6990 (using linux), as that is what will give the best return on your investment. Dedicated miners are a risky business if you pay for electricity, and even more risky if you pay more than 10cents the KW/h