I have the new Vita, and frankly the screen is fine IMO... leaps and bounds better than my regular PSP for sure. Now I know the OLED is supposed to be better, and I suppose it is, I haven't done a side by side comparison, but when the slim version has better batteries and whatnot too, I personally wouldn't dismiss it altogether if you were looking for a new vita. I'd suggest just getting the best deal possible regardless of what model it was. I really have no desire for a better screen on mine. Better is better and it's always good yes, but I have yet to find myself thinking "gee, I wish the display was a little nicer" or whatever.
Did I rub in I got mine for $120 canadian? Sorry, I just can't get over how fucking good a score that was. I did such because at the time stores like Amazon were selling some borderlands 2 + slim bundle for 200 CDN. Also, here in Canada (or at least BC), Target the retail chain was going out of business, so they were liquidating them for $200 as well... But they didn't sell all of theirs (no wonder since they weren't any cheaper than amazon and no doubt other stores), so they apparently allowed in-store employees buy it off them for $150 after.. I bought mine from a friend of such an employee who only got his for 150 because he wanted it to pirate games, he didn't realize that was the psp not the vita. So yeah, he opened the box, and used the vita for all of like 2 hours. But the recharge cable was still factory wrapped, and the battery was still 3/5 full, so it was pretty much new. He then decided to resell it for 120. I got my 3ds for like the same price too. eeeek, I just love getting consoles for criminally cheap!
Rhythm games aren't really my thing though, but it seems that the Vita is oddly enough becoming the platform of choice for dungeon crawlers of all things. I'm hoping that the 2 coming out soon will be good too (Dungeon travellers 2, and operation abyss.
And yeah, it's also got a big selection of indie games. where the portable factor is nice. I mean I never tried shovel knight yet cuz my interest towards traditional platformer games is permanently tarnished after the 8/16 bit era, but if I ever did buy shovel knight. I'd get it on the vita because you really don't benefit from pc power and graphics on such a game, might as well have it on the go IMO.