i am going to be upgrading my current Macintosh DAW from a G4 to a G5, however i am unsure of which model I should choose. I could not find any specific links to view a side by side performance benchmark of the two. Can anyone tell me if the dual 2.5 performance is really that much different/better than the 2.0? Are they close? is the dual 2.5 worth the extra $500... or should i go with the dual 2.0 and sink the $500 into extra ram. ( I planned on purchasing 4GB ram for either model) Also, can anyone tell me what "frontside bus" is and how that impacts performance... the frontside bus on the dual 2.5 is slightly faster. I will be using DP4.5, 3 MOTU 2408, w/ virtual instruments like mack5, DFH superior and Stylus RMX. thanks.