I'm not going to pick numbers because it is (some what) arbitrary, but the ranking will go 1) PS2 / Wii (I think it will be close, either could take it) 3) Nintendo DS 4) XBox 360 5) PSP 6) PS3 (Motorstorm will provide enough of a sales boost to outsell the GBA) 7) GBA 8) Gamecube 9) XBox PS2/Wii will sell (roughly) twice as many systems as the XBox 360, and the XBox 360 will sell (roughly) 1.5 times as many systems as the PS3 ...