my list.

[RC-Monster Mike]

The IB 3800s aren't due till next month. The IB 3600s are the same size as the 3300s, but with lower IR. The 3800s should have better voltage and equally low IR. Not sure on the size. The gp3700s are only slightly bigger from what I understand, and should'nt be an issue for the g-maxx chassis, especially with the new battery hold down that will be available soon.