Anything but Medieval Total War - it's the buggiest piece of rubbish I've ever come across (this isn't just me - just do a search for "crash to desktop" with medieval total war, for example).
And it's not just the machine, I've tested this on 4 different computers, with different makes of motherboards, chipsets, operating systems and five different graphics cards (from ATI, Intel, NVIDIA, VIA and ancient Voodoo Banshee). There are a wide variety of bugs, often leaving the game unuseable - including crashing to desktop, getting stuck in an endless loop in the menu system, not being able to pass a certain year, not being able to select units, and graphics corruption. Some people report success on a particular Intel chipset if you stick with old drivers, but often there's no fix. The makers have refused to fix the bugs - there was only one patch years ago which didn't help at all.
I haven't tried any of the others - but I'm not sure I want to waste my money again.
And it's not just the machine, I've tested this on 4 different computers, with different makes of motherboards, chipsets, operating systems and five different graphics cards (from ATI, Intel, NVIDIA, VIA and ancient Voodoo Banshee). There are a wide variety of bugs, often leaving the game unuseable - including crashing to desktop, getting stuck in an endless loop in the menu system, not being able to pass a certain year, not being able to select units, and graphics corruption. Some people report success on a particular Intel chipset if you stick with old drivers, but often there's no fix. The makers have refused to fix the bugs - there was only one patch years ago which didn't help at all.
I haven't tried any of the others - but I'm not sure I want to waste my money again.