I heard UB is good but I would suggest HU SNGs. The rake in HU cash games at lower limits adds up. Plus, in cash games you'll run into short stack ninja hit-n-runs often.

I played a bunch of $50 hu sngs over a 3 week period but the starting stack was 1000. You couldn't make many mistakes before being short stacked. I played some guy and lost 8 times in a row even though he wasn't very good (guess I'm not either). When allin I was a favorite 75% of the time and lost - no joke. That was very annoying.

It was a good experience but I'm back to shorthanded multitabling now. People consider 65% winrate at HU good and 70% amazing. So, you really have to be in that range or you are wasting your time when you factor in rake - at least compared to how you could do multitabling shorthanded or full ring.