I would go with 2000...there are some isues about running older games, but all the new ones will run fine...It definitly is a more stable system than 9.x and has qiute a few features that 9.x dosent have such as NTFS which makes better use of hard drive space...Incidently ive never notice any better game performance with FAT32 over NTFS,Ive always found NTFS is the way to go, unsell your dual booting