Coins in a week - as in whole bitcoins?
Its all about hashrate - not CPU/GPU/ASIC not worth comparing hardware type unless you want to compare Hash vs power consumption (FPGA/ASIC will always win VS CPU/GPU for BTC).
My 2000Mhash rig can mine a whole BTC in about 33 days. (5 Block eruptors and a 6770)
And then you need to look at ROI - you'll never make your money back on some stuff now
i bought 2 block eruptors @ 4.2 BTC and 3 @ 3.25 - i've just mined 1 BTC in total 5 i have currently! (2 months)