I give my vote for a linux client.
Used to dual boot but now days it is Linux 100% of the time. Work SLES 11, home Kubuntu 13.04.
Now that Valve is porting games to linux I have been rocking my old orange box again (CS:S, DOD:S, TF2, etc…) And although the selection is small I have been presently surprised with the linux ports that are available. Currently trying to get GW2 working on Wine, we’ll see….
Codeweavers looks like a good choice for a linux port. Isn’t that what Arena Net used for the Mac port?
http://www.codeweavers.com/services/faq/ports/
Valve’s steam box is supposed to be linux based. can’t wait.
For those not aware there is a Steam Linux Users Group
http://steamcommunity.com/groups/steamlug
http://steamlug.org/