I'm really looking to try out some more MTT's as my run at the 45 and 180 man sit and go's has been quite profitable.

What would be the suggestions for good MTT's on Stars with a reasonably long structure (at least 15 min blinds), with a bankroll around $650.

I can normally do well in rebuys as well so I was thinking of trying a couple of 3+R's but I have the feeling I'm underolled.