Answere to the question: "Do You really need a tyros 2"
No, I think KORG OASYS would be enough(even thou i dont have one yet),
and by the way that PSR-3000 Dude is a great player, he also has videos of himself on TYROS, so don't assume he just uses psr-3000, he has a tyros too(even thou both Tyros/tyros 2/PSR-3000 are very semiliar... but tyros 1 and 2 are more colored and stuff, which attracts kids very much)