:Hi there PeteG

Thanks for the info, very helpful. I have decided to do the following:-
Buy the system as quoted in my first post. Go with the NVIDIA 9500GT.
Buy an Xite1.
Fit my 2 Powercore MKII cards into 2 of it's PCI slots.
Fit the Magama Chasis into the other PCI slot and use 2 more Powercore MKI cards in it.
Fit the Xite1 into one of it's PCIE slot.
Sell my UAD1 cards.
I have decided that 2 screens will be enough for now. The dual head splitter option is always possible. Thanks for pointing this out to me.
The Xite1 is a great as it has loads of DSP and none of the latency incurred with the Powercore and UAD cards. I will still use the Powecore cards for their Virus and VStation plugins. Plus it does have loads of other great plugins that I love (Filtroid, NonLin2, Dynamic EQ etc.). I like to mix (add EQ, compression etc.) as I track rather than do it all at the end, so the UAD cards can be a bit of a hassle with all that latency building up! The UAD plugins do sound lovely but with my Sonic Core Xite1, Powercores and, of course, all the extra CPU power, I think I should be able to cope without them

. I do have every UAD1 plugin except for 4, so hopefully I should get a decent price for the UAD1 cards

That money will come in very handy once I have purchased the 3XS SA-i7 PowerDAW and Xite-1!
Spoke to Lee at Scan today who was very friendly and helpful.
Just about to put the orders in now......................