New Gaming comp based on Intel + ATI

Hi there, I was browsing the internet for couple past days to build a good GAMING system for my budged, which is about £800($1600) (without LCD) . Here is what I've put down:

GPU
Sapphire HD 4870 512MB GDDR5 Dual DVI TV Out PCI-E Graphics Card £176.23

acctually I want two of those, so I need all the components to support Crossfire with two X16 lanes
I have 1680x1050 LCD resolution

Motherboard
I need a board that would fuly support two HD 4870 cards, so I went for X38 chipset boards. I also want raid 0 to be decently supported.

ASUS Maximus Formula Republic of Gamers iX38 Socket 775 8 channel audio ATX £149.96

RAM
Corsair 4GB (2x2GB) DDR2 800MHz/PC2-6400 XMS2 DHX Memory Non-ECC Unbuffered CL4(4-4-4-12) Lifetime Warranty £70.00

HDD
I want to go for two 500GB(may be also less, but 500gb are for reasonable price now) in RAID 0
Samsung HD502IJ SpinPoint F1 500GB Hard Drive SATAII 7200rpm 16MB Cache - OEM £42.29x2=£85

CPU
this is a big dilema for me, whether to go for 2 or 4 cores. Anyway here are some options:

Intel Core 2 Duo E8400 3GHz (1333MHz) Socket 775 6MB L2 Cache OEM Processor £119.98
Intel Core 2 Quad Q6600 Energy Efficient 95W edition Socket 775 (2.40GHz) G0 Stepping L2 8MB Cache OEM Processor £117.49
Intel Core 2 Quad Q6700 2.66GHz 1066MHz FSB Socket 775 8MB L2 Cache (2 x 4MB (4MB per core pair)) Retail Boxed Processor £159.99

or maybe even more expensive quad cores?

CPU cooler
a decent quiet cooler...
Arctic Cooling AC-FRZ-7P Freezer 7 Pro Socket 775 Processor Cooler £15.49

DVD drive
cheap decent DVD drive...
LiteOn DH-20A4P-21C 20X DVD±RW/DL/RAM Black Bare Drive - OEM £14.87

PSU
this is extremly important, I don't have to explain why. I chose 700W cheap one, but I'm not entirely shure that it's going to be enough for two 4870 in crossfire.

Hi-Power Black 700W 14cm Blue LED Fan PSU - 20+4pin 4x SATA 4x PCI-E £44.98

i might need a better, more expensive one...

Case
i like the TZNM but I can change my opinion, doesn't matter much. Any good cheaper suggestions?

NZXT Tempest Steel Mid Tower Case - No PSU
£68.99

Mouse + Keyboard around £25
that makes it £770 . but I might need a better PSU...

Please share any suggestions. However I'm pretty sure to go for Intel CPU and (2x)HD4870 GPU. And remeber my prime interest is gaming, although not only gaming

thaks for reply!

first of all I'm going to wait another 2 - 3 weeks before making final decesion, so I could wait until august.

I did not go for X48 because they require DDR3 only, which is still expensive now. I will have to change the PSU

anyway, what Windows (Vista) ? 32 or 64 ? with for 4Gbs of ram... but what if games don't support 64, I havent made any reserach about that yet...

why would I pay £30 for a X48 motherboard? whats the benefit ? it proved to be exactly same fast(or even slower) as the p35/x38 mobo.

2x4870 now don't make any sens, but in a year it can be very usefull combo I think.

go and check old post

guys after I've done updates and here is my build now.

GPU
Sapphire HD 4870 512MB GDDR5 Dual DVI TV Out PCI-E Graphics Card 179,99

MotherBoard
Gigabyte GA-X48-DS4 iX48 Socket 775 8 channel audio ATX Motherboard 139,96

PSU
Antec TruePower Quattro 850W Modular PSU - 2x 8pin PCI-E 2x 6pin PCI-E 4x 12V Rails 97,84

CPU
Intel Core 2 Duo E8400 3GHz (1333MHz) Socket 775 6MB L2 Cache OEM Processor 119,98

RAM
Corsair 4GB (2x2GB) DDR2 800MHz/PC2-6400 XMS2 DHX Memory Non-ECC Unbuffered 67,92

HDD
Samsung HD502IJ SpinPoint F1 500GB Hard Drive SATAII 7200rpm 16MB Cache - OEM 42,29
Samsung HD502IJ SpinPoint F1 500GB Hard Drive SATAII 7200rpm 16MB Cache - OEM 42,29

CPU Cooler
Arctic Cooling AC-FRZ-7P Freezer 7 Pro Socket 775 Processor Cooler 15,49

Case
NZXT Tempest Steel Mid Tower Case - No PSU 68,99

DVD-ROM
LiteOn DH-20A4P-21C 20X DVD±RW/DL/RAM Black Bare Drive - OEM 14,87

altogether 789,62
I would like to OC for sure - about 25%. And second 4870 after some time...
What do you think?