I would play or Americas Card Room/Black chip Poker.
I never played on Bovada So I can not comment. Carbon Poker is way down on traffic these days, mostly due to slow cash outs.
Carbon is good, and probably the most
linux friendly site to play on. Their client runs flawlessly on Win-d'ohs, and will run on any 32 bit compatible Linux through WINE. Doesn't make much difference, as the client looks and works nearly the same as "Instant Poker" that runs through the browser. I used the client to upload an avatar.
I haven't seen any evidence traffic is down at Carbon. As for pay outs, all I've heard is rumours and counter rumours. As for the vast majority of Carbon players, I'm sure that cashing out is one thing they'll never have to worry about they're sofa king bad.
I also play Bovada, and haven't had any problems running their client on Win-d'ohs Yecchs-Pee. They do offer games for lower stakes than does Carbon, if that's what you want. Also, more PLO games
There are other options, but those are the ones I can vouch for due to experience.