if you had a choice of getting a dual 1.8 w/ 1GB to run a UAD flawlessly or passing on the UAD to get a 2.0 w/ 1GB, which would you choose?

Will the CPU and front bus make that great of a difference?

I really love access to those plugins and i hear it runs poorly on the pci-x slots in the 2.0s+

Also, are the processing tools of great enough quality in DP 4.5+ where not having the UAD will not effect my mixes dearly (I can always get powercore or waves, right?)