The advantage of the E8600 is streaming and a better cache design resulting in low buffer usage.
Live/realtime isn't that much of a biggie if your just sequencing and using VST's. The Quads would be a more suitable choice, depending on how many VST FX and VSTi's you use.
I noticed too many pops and crackles from the quad's cache design using Kontakt 3 at the lowest buffers.
The new Quad i7's have no problem doing any audio chores though. And I look forward to a new build when the H57 chips mature. Until then XP32bit SP2 and the PAE Switch loads 4 x K3's under Bidule at 128. I only use 12 instruments purged and 8 MIDI channels.
Lot's of Mac/Logic guys go from 128 tracking to 256 for mixing using the new i7's and seem to be very happy. And lots of Core2Duo Quad guys seem happy as long as they aren't using Kontakt/Bidule.
I am happy your DP35 works as well as mine. No frills equals no spills.....
