Any of you got Eye-Brawl? If you do, what path do you think is better for him? I don't use the eye ball blaster move that much but it seems more interesting than the melee path that just upgrades his armor and attack power, plus gives you a new combo(I don't bother with the fancy combos, button smashing kinda works in this game just as well).
I think both of his paths are rather boring. I chose the Eyeball expansion, and it's just basically like having trigger happy, except the eye ball is quicker.
You should try both, and see which one you like better. I think a fully upgraded thumpback is a much better character, even with the speed reduction.
A quick way of earning funds is to just do the arena challenge before the very last one in the game. It nets you a quick 1100 for a minute or two of work...rinse and repeat. Boring, but better than most of the alternatives.