The RIA versus the GT4 wheel is an interesting comparison. I happen to have both on hand right now. The GT4 wheel is surprisingly light, great bang for buck. BBS RIA build quality is better. It simply has more details to the design, it's forged, and about 1/2 lb lighter. EDIT - I believe that both wheels are forged based on my research on the manufacturer of the GT4 wheels
Fitting 10.5 on the front is not all that difficult. Fitting an 11 on the front is possible but does require a specific setup. I don't think -4 camber is required based on my testing. I'm at -3.3 and believe I can fit an 11" wheel in front with my camber and 295's.
Pic of the two wheels side by side for comparison >>>>
RIA vs GT4 by
slicerM, on Flickr