I'm more into the Dimps 2D style fighters like Budokai/Shin Budokai/Infinite World/Burst Limit. With that said, Tenkaichi Tag Team looks like a lot of fun. I own a PSP Go (as well as a clunky UMD model), so I'd pick it up assuming it shows up on the PSN.
As for Raging Blast 2, my only interest in the game is the remake. That said, Funimation says it'll be Sub-only, and have hinted that they might later be doing a release of the remake themselves. So unless RB2 gets acclaimed, I'll probably sit that one out again.