At what stakes should I consider leaving Stars for a softer site?

[jj_frap]

This is a long term question, as I don't see myself being able to afford a bigger game than PLO50 any time soon.

Having played at Stars and having watched micro-limit Omaha at other sites, I can comfortably say that the players are so wretched at these stakes that the difference between sites -- unlike in HE -- is infintesimally small. I've also heard, however, that after PLO100, Stars gets considerably tougher than other sites.

I only play PLO25 and have started playing PLO50 over the past couple of weeks.

I normally play 1 - 2 tables and will occasionally play 3 if there are a lot of soft games at a given time.

I intend to buy PTO this weekend (when I know that I won't have to pay it off till late December) now that these past 3 months have cemented Omaha as my game of choice.