I finally picked up a new Xbox 360 Saturday to replace my failing one.  I got an Arcade model since I already had a 120GB hard drive.  I’m not 100% sure that I got one with a Jasper mainboard though.  It has the 512MB on board storage but the PSU is the same size as my other 360.  Regardless, everything went great.  I plugged it all up and snapped on my hard drive.  Fired the system up and loaded my gamer profile.  Now I have another wireless controller and set of PSU and A/V cables.