RooRs are amazing bongs. The 3.2 mm glass is good, but the way I see it, if you're going to throw for that kind of quality, go for at least a 5mm.

Second, get ice notches in your bong! It's worth the extra money; hitting bongs over ice like that is just incredible.

Finally, I've never tried a Gear, G-spot, or EHLE glass-on-glass bong, but it seems they're probably as good as a RooR--still though, the RooR logo has got to be worth something.