I tried the integy wheely bar out on my G3R. It didn't last long too long for me. The wing does a pretty good job for the G3R from flipping over. I went through a lot of the traxxas wheely bars on the emaxx. The part that breaks on them is fairly cheap to replace but get to be a pain always replacing them. You thought about not doing any wheelies?
I use the Integy wheelie bar in my g2r. It has work well and I like it looks, but im a bit cautious since other people has not so good experience on integys stuffs. And second its quite pricey.. Look my G2r Project thread, theres some assembly pics of it