Go with the GP3 black edition. Its ability to have higher frame rates and built in wifi is worth the cost.
I'm not a fan of tower mounts unless your trying to capture stuff for instruction. For entertainment you loose to much detail even with the narrow settings. I prefer it attached to a monopod.
The link is with a gp2 on monopod. Since it was taken I have added wifi with remote and smartphone link. This decreases video clipping and camera setting changing time dramatically. I would highly recommend wifi and remote.
https://www.youtube.com/watch?v=RFWQ...e_gdata_player