After MUCH research, I decided to go with this guy over a lot of other installers on this board. For one thing, he had the best price, BY FAR. He doesn't jack up the prices of hard drives or mod chips like other installers do. He sells them to you for exactly what he pays for them. He tells you upfront what his cut is, and it is VERY reasonable.
I called him and he told me exactly what he was going to do. He is working on building me a pre-modded xbox right now. I should have it in a few days. I'll post again with my results.
I am not some made-up poster on these forums to give good feedback like a bunch of other chip installers use on here to pad their feedback. Good or bad, I'll post back in here when I get my xbox.
So far, thus, I have been very impressed with Aaron. I'll let you know.