First, I want to say thank you to everyone on this board for helping me troubleshoot many of the questions that i had before i went out and bought my new system. SO, i would like to share with all of you what i purchased and how well what did or did not work. Computer: Mac G5 Dual 1.8 OSX 10.3.9 2.5GB Viking RAM OS 7200 RPM Drive Audio/Samples 7200 RPM Drive Dual Sony 19" LCD Monitors MAudio Firewire Audiophile Software: Digital Performer 4.52 Mach Five 1.2 Kontakt 2.0.1 MX4 2.0 Sample Tank 2 XL Audio Ease VST to MAS Wrapper Recycle 2.0 Bias Peak 4.0 UAD Project Pack UAD Precision Limiter Here are my results and opinions: 1 - The Dual 1.8 G5 works wonderfully and seems to have enough CPU to continue to crank several instances of instruments and many stereo aux tracks while running real-time PERFORMANCE: My CPU overload test was: 23 UAD plug-ins (a master chain and 19 EX1s) 1 DP Master EQ 12 Stereo Aux for Drum Kit via K2 via VST to MAS Wrapper 3 Stereo Aux for Percussion via K2 via VST to MAS Wrapper 5 Stereo Aux for 5 instances of MX4 1 Drum Subgroup 1 Percussion Subgroup 1 2 Track Subgroup 1 Synth Subgroup 6 Tracks of sequenced MIDI All the above while having each instrument instance visually opened ie all 5 instances of MX4 on the screen... Hardware setting at 512 Buffer and 24bit / 48k CPU runs about 95% Purring like a baby... 2 instances of MX4 (bass and synth) 1 instance of MAch Five (drums) Stereo out of Kontakt percussion (with 3 instruments) 6 UAD plugs ie Pultecs, 1176s, LA2s, PE 6 MIDI sequences Hardware setting at 512 Buffer and 24bit / 44.1k CPU runs about 30% Other notes:- Digital Performer does support AU but DOES NOT support multiple outputs for Audio Units, only for MAS - Audio Ease VST to MAS Wrapper works perfect on Sample Tank 2 but is buggy with Kontakt 2 (NI instruments do not play nicely within wrappers) - Several instances of "tiny" UAD plug-ins will add more CPU host processing than if you use less high CPU UAD plug ins - Mach Five does not seem to import Kontakt 2 instruments although it imports Kontakt 1 instruments - MX4 can not be routed directly to a mono aux, upon load DP will ask to clear the instrument instance as it is found missing, there are work arounds - Most used UAD plugs include Pultec EQ, LA2, 1176 and Precision Limiter (PL sounds "rounder" than Waves L2) - Kontakt 2 library DESTROYS Mach Five library in all aspects ie quality and quantity (M5= 4.5GB / K2 = 15GB) Well, I hope this helps some of you out there. Overall, this sytem performs quite well and almost flawlessly. I have switched over from Sonar 3 on a PC running a P4 1.8 with 1GB RAM.