Chris,
The nice thing about Oly Arms is the waranty. I'm sure you've seen it on their website. The price of the kit isn't bad. All you have to do is find yourself a lower. Either fully assembled or you can assemble one yourself. You say your mechanically minded but your also new to AR's. Your better off getting a fully assembled lower.
When shopping for an AR, try and follow the ABC rule. Armalite, Bushmaster, Colt. Oly Arms has gotten better in quality over the years. But they don't come close to the rifles I mentioned before.
I myself have a Bushmaster. I came pretty close to purchasing a PCR-4 20" but a good deal came around for the Bushmaster. I say wait a while and save up for a Bushy. It may be a high investment for you, but you'll be happy you did.
As a dealer, I price my Bushmaster rifles between $800 to $900.