New Gaming System Build Options

I need a system capable of playing Crysis,COD4, Assassins Creed, UT3 smoothly at 1024x768 or 1280x1024, It's time for my upgrade anyway so I can spend around a grand (GBP). I would like to get into the habbit of moving with the times, so it only has to last up to a year, with upgrades such as GPU/CPU/MOBO possible in the year, doesnt have to be futureproof, just work now really well.

I already have SATA hard drives to migrate to this system, but the raptor seems fast (10k rpm, 4.6ms seek time) so I was gonna get one for the system drive. I have an PATA optical drive/floppy/card readers already I can re-use or choose myself, have perhiperals etc, just need the new core system.

-Note: I currently run four monitors (including a plasma for movies) so in the non-SLi system I would like to be able to have 2 PCI express slots, one for the main card, one for my old card which will run my secondary monitors, but I dont think it has to be anything fancy like 16x for my old 7800gtx, probably 4x would do, it's only for extra screen real estate.

I am shopping on http://www.overclockers.co.uk becuase I dealt with them before and they do 0% for 12 months over £333 or something!

Please let me know what you think, heres my notes so far:

System 1: E8xx based, P35 (ddr2), single GPU
-----------------------------
pros:
cheaper than sli (two cards)
stable
good for OC
good choice of P35 motherboards available
cons:
cannot use SLi

Intel Wofldale E8500: £200
Asus P5K Premium/WiFi-AP Intel P35 (Socket 775) PCI-Express DDR2: £109
Corsair 4GB XMS2 PC2-8500C5 (2x2GB): £117
BFG 8800GTS-G92-512: £188
OR
EVGA 9800GX2 - £411
PC Power & Cooling Silencer 750 Quad-SLi PCI-E 750W Power Supply: £105
Western Digital Raptor 74GB 10000RPM SATA 16MB Cache - OEM (WD740ADFD): £91.64
Silverstone Kublai KL02B-W Midi-Tower with Window - Black: £76

Total (8800): £902
Total (9800): £1126

System 2: E8xx based, nForce (ddr2), dual GPU
------------------------------
pros:
higher end gfx performance
more future GPU options (tri-SLi) available
cons:
more expensive outlay
less stability
slightly less flexibility for overclocking
need a new NB fan for the mobo?

Intel Wofldale E8500: £200
EVGA nForce 780i SLI nForce 780i: £168
Corsair 4GB PC2-8500C5 (2x2GB): £117
2 X 8800GTS-G92-512: £376
PC Power & Cooling Silencer 750 Quad-SLi PCI-E 750W Power Supply: £105
Western Digital Raptor 74GB 10000RPM SATA 16MB Cache - OEM (WD740ADFD): £91.64
Silverstone Kublai KL02B-W Midi-Tower with Window - Black: £76

Total (2x8800GTS): £1133

what do you think?

Ok thanks oushi, I agree after reading a bit more, the non-SLi will be better at lower resoloutions, I just hope I have chosen a good motherboard, I also like the IP35-Pro and now the Asus is not on offer, I will probably get the IP35-Pro instead, thanks for your Input!