Any thoughts on which system to buy...

I have an Xbox now but that does not affect my decision in anyway...I just want the superior machine...is it a definite that the PS3 will be better graphically??? I'm ready to pull the trigger on the 360, but if the PS3 is going to be better I'm willing to wait. FYI I could care less about the HiDef DVD w/ the PS3.

Thanks!!!