There's no Mac client. You can install Windows through Bootcamp and dual boot or through Parallels (would need to buy Parallels (or VMWare), usually can find it in a bundle at below retail) from within the Mac OS. Also, make sure the Mac in question has a discrete video card.
Apple has been slacking on their desktop and notebook division the last few years, so you might want to take a pass on them, especially if you do a lot of gaming.
I don't suggest Parallels or VMWare - they may have gotten better since the last time I checked, but virtualization software tends to have issues with graphics cards and graphics-intensive games.
I've heard rumors that it's possible to get the client running on a mac using some variation on Wine, but I haven't tried to do that myself, so I've no idea how difficult the required setup is. (Probably very, if it even works at all.)
The only real option is to use boot camp. All others would bog down the system too much. The higher iMacs and a MacBook Pro 15 can handle this game. I play on a MacBook Pro 15 with a 1.5 nvidea graphics built in and it works fine. Do not use VMware, parallels or wine it will be like running 2 operating systems at once. So far I think I'm the only one that has responded that actually does it. I do believe Kaiserin plays on an iMac but I cross wires all the time so I may be wrong.
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And playing by myself since Aug 2009
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Apple has been slacking on their desktop and notebook division the last few years, so you might want to take a pass on them, especially if you do a lot of gaming.
I've heard rumors that it's possible to get the client running on a mac using some variation on Wine, but I haven't tried to do that myself, so I've no idea how difficult the required setup is. (Probably very, if it even works at all.)
Epic Stronghold
Block timing explained