Titan, with Bodog and Absolute as joint 2nd choice.
Don`t want to seem negative, but the selection in your poll is very limited and some of the biggest sites are missing.
How about:
Party
Titan (and Ipoker sisters)
Bet 365 (and Prima/Microgaming sisters)
Absolute
Poker Room (and Ongame sisters)
Much as I like Bodog, all of the above are larger and more popular.