They are being fully utilized though. Even I7 wont keep up in cubase 5.5 when 6 cores are in use. HT or not. Not much difference! But cost wise it makes I7 a silly choice. This is a thread asking specific questions, for a program with hex optimization.
With regards to your choice OP. Its a wet dream.
2 screens though with 8gb. Nice! Do you record you own stuff? 2 screens is going to be fantastic, I do guitar, vocals and syth drums, 2 screens is just so damn good, after a week of using them, you'll wonder how you got by without.
Just thought i better mention there are better sound cards than the Xifi Titanium. M-audio for instance do some, But there is by no means anything wrong with the card you've chosen.
It's a bit similar to when you get graphics cards. Quattro and Matrox make the best graphics cards for editing graphics, But AMD and Nvidia make the best for most stuff and they're pretty damn good when it comes to graphics too. (I am slightly drunk so I may be rambling

But I think you get what Im saying)