Hiya Zweibelchen!
I'd just like to say, first of all, thank you so much for creating and maintaining Gaias for all this time! I've loved playing the game for many years ever since it first came out, and hopefully for many more to come!
I'm absolutely stoked by the fact that you're thinking about 'upgrading' the game. Personally, I would side with going over to Dota 2 because it's a free game, and I don't have SC2. I really like Starcraft, just that it was abit pricey for me - especially with the expansions. Anyway, I fully understand your point about Dota 2's graphics being cartoony - when I first got a look at it, that was exactly what I was thinking. But when I actually tried the game, the graphics actually blend quite well, and quality-wise is quite decent. Of course this is only my opinion, but I've seen SC2, as my brother owns the game, and I would definitely say that it has stunning graphics and mechanics as well.
(Also, it is true that D2 - Reborn specifically - is still currently in the works, and from your point of view must not be a very 'stable' choice)
Either way, I'd be happy to play the game on whichever game you choose to take Gaia over to. If it's D2, yay. If it's SC2, I'll buy the damn game (+ all the expansions) no problem.
Hopefully it will all work out nicely for you Zwieb!
Lucky
Edit: Woops, I had no idea this was an old thread with the last reply being 2 months old. Sorry