Im not the best to advise on cash games as I'm mainly an mtt player but have a look at the ipoker network.
I have played on iPoker network for 10years and personally I would NEVER recommend it to anyone, especially not a micro cash game player (rake is higher than most of the sites & there's next to NO traffic on the network these days & it keeps on getting worse).
As far as the other answers go in this thread, I'd have to ask each & everyone of them, What sites do you actually have experience on? And what exactly is THAT exeperience?
ie. a guy from Slovenia who figures a site is good if "they have lots freerolls!"
ie. a guy who suggests to play on MPN... has he even played anywhere else?
Without a doubt I believe your next choice for R.O.W. players (after Stars) these days would be
partypoker ainec. Partypoker has recently increased their micro buyin (& low, mid & especially High) tournament schedule. They also have much greater volume of players playing on their cash tables vs. the other sites. (888poker might be softer, idk, I haven't play on there in years as the traffic seems to have decreased significantly on there).