Staying with Civ IV for the foreseeable future. Just built a new box (AMD Phenom X6 1090T CPU, ATI Radeon 5870 Graphics, 8Gb RAM, 2 SATA 6 HD's in RAID 0, Win 7 Ultimate, etc.) so running the game wouldn't be a problem. Civ IV has become a highly polished, excellent game and with all of the mods available it still hasn't become old for me. The fact that Steam is required to run the thing puts me off of it completely.