It may be beneficial to buy bitcoins low and sell when their higher. The wait time for BFL products is ridiculous considering how often the difficulty increases. Also the Erupters aren't enough hashing power to make any real dent in bitcoin mining.

If you got $14k laying around check out cointerra. Supposedly they are coming out with a new ASIC machine shipping out in December.

2 tera hashes per second

http://cointerra.com/
http://arstechnica.com/business/2013/08/chip-veterans-form-new-startup-will-sell-high-end-bitcoin-miner-for-16000/