Ok, right now I have the following setup:

P4 2.8 s478
Asus P4G8X
2 GB DDR
PreSonus Firepod
UAD-1

I am thinking of upgrading to a dual core system since they seem pretty cheap these days:

P4 D830 3.0Ghz s775
Asus P5P800
2 GB DDR

The main reason I want to upgrade is I plan to use my old box as a vst plugin slave using fx teleport. Now my question is, will I have problems with a dual core system with my applications? Or are there similar issues as with hyper threading? What do you guys think?