If you have sufficient collateral that can be placed in escrow during the loan time, you probably don't need to bleed yourself with such high rates. 
I don't have a lot, thats the problem :/ but I am willing to work with people both on that, and verification.
How do you plan paying an extra $750 USD in 2 weeks? along witht he rest of the 4.5 BTC, which is almost $3400? How much of your own money will you invest in this mining rig? If it's less than the loan amount, well, I got bad hopes for you. Especially when you don't have a collateral.