My suggestion is to never play anything less than $5/$10. Under that, especially in Vegas, too many people play loose and you'll get sucked out on many hands by these people catching lucky hands. The rake isn't really a concern. I think you should find a $100 or $200 buy-in no limit table (if you can afford it
). You'll still have some really loose players, but not as many. Follow Phil's advice and play very tight but very aggressive.