No one is going to back this up, I might even get flack for it, but get the Jazz-yo X Yo-Cats Regulus.
Honest to god, best yoyo I have ever played. In my opinion, this is the NSCO helix gone right. WAIT SWAT, HELIX HAS STEEL RIMS! Yeah, and the regulus has steel weight rings that also act as a psuedo IRG. That steel weight rings cause very tiny vibe that is very hard to notice, but makes it outspin every single yoyo in my case, and I have some very high end yoyos. It is amazingly stable, the only undersized I have tried so far that can do horizontal tricks on par with fullsized yoyos. It has a very positron like shape, pretty similar, but 50mm and with STAINLESS STEEL WEIGHT RINGS ON IT! Get this thing, best undersized and definitely in competition with my overdrive for my number 1 throw.