Civ4 and expansions are available on Mac and happen to be my favourite. I also enjoyed Warhammer 40k: Dawn of War so much that I decided to buy parallels to run it. It has been the mainstay of many a \'LAN fest\' with my friends... I would also echo support for the Total War series, I played Shogun (the first shogun) once and was hooked on Total War immediately. Sadly it isn\'t available for Mac and parallels gets quite freaked out by it. If your interested in another style of game I would also recommend Silent Hunter 3, the second game I bought parallels for. It runs like a dream and is relatively old now. Still one of my favourites. Hope this is useful.