-> Switch to Litecoins with can't have Asics
Why do people still believe this? If something can be done on a general purpose chip, it can be done on a application specific chip.
Because it will be expensive.
HELLA expensive. You need the fitting RAM on it. If a 7970 at 700kh/s needs around 1.5gb of GDDR5 ram, consider what amount you need to make a 5MH/s Scrypt miner. (The answer is around 64gb GDDR5 ram)