ZBrushCentral

Mac Users, Quick Question

I am currently working on a 400 MHz, 128 MB Ram, 12 Gig, G3 processor iMac DV S.E., I am looking into upgrading to a PowerMac. Is the difference noticable between a G3 and G4, is there anything i should know about for this upgrade? DOes anybody have any similar stories??

Thanx,
Chad