Just curious what is really flimsy and cheap about your friend's archangel kit? Does he have an older or a newer kit?
I just built a 10/22 with one of the newer 556 archangel kits, and it's anything but flimsy or cheap. I've held both guns, and was very impressed with the quality of the archangel kit. I can't hardly flex the hand guard if I try, the polymer used is very high quality, and the fit with my receiver housing is superb.
If an AR-15 clone or training gun is what your going for then the 15-22 is the way to go, as it functions exactly like a real AR. However, if you don't care about AR functionality and competition accuracy and reliability is what your after, then the 10/22 built up with some aftermarket parts just can't be beat in my opinion.