Hi all. I am relatively new to maya, and have decided to get a somewhat 'dedicated' machine to bring me to an intermediate/strong intermediate maya user. I want to learn texturing/rigging all that good stuff. Pretty much settled on a new Imac for the job, but unsure about the graphics card. Choices are the NVIDIA GeForce GT 130 512MB or the ATI Raedon HD 4850 512MB. Does anyone have any recommendations/experience with either?