A good tip would be that USB Eruptors have dropped price and are selling for 1 BTC now. This is good as a substitute for GPUS.
On the other hand, there are several people that are making boards that will take BFL Chips that they are selling that is also a good option =)
Heres a USB Eruptor miner group:
https://bitcointalk.org/index.php?topic=241434They get 336 mh/s