Any ideas for my build?

Hi, anyone who read my other post will know that I have just bought a 8800 GTS only to find that it will not fit into my motherboard. So I have decided to upgrade alot of the parts. Here is my set up so far;

Video card - 8800 GTS Bought
CPU - Intel quad Q9450 £240
RAM - Cheap 2GB 800mhz CL4 Corsair Bought
Case - Something with good cooling (Coolmaster?) £150
Motherboard - Something with Nforce 7 £150
HDD - 7200RPM maxtor 80GB Bought
PSU - 400 watt Bought
O/s - Not sure

As you can see I am keeping alot of parts due to lack of money. I have Windows XP but its OEM and I am getting a new motherboard so I have to buy another one some how . Will the Intel Q9450 overclock better than a Q6600? I want a good case for over clocking. The reason I want an Nforce motherboard is because I want the option to SLI in the future. Will a 400 watt PSU be good enough for this?
Any ideas?

I think 400w PSU is a close call for that config, and if you plan to sli it won't be sufficient for sure. I had e6600 and 8800 gts 640 some time ago powered by 400 watt psu and it worked,however when under full load it was loud as hell so i wouldn't recommend. If you can return that psu and pay some extra for quality PSU 550-650W.That should do for 8800 gts sli later on, 650w preferably.

I have not bought the motherboard yet I just wanted the chance to SLI in the future. So I have to choose between overclocking and SLI? With a good case (£150) what would I be able to get the Q9450 up to?

Oh I guess I will have to buy another one in the end. I know with a CPU paying more means you get alot better product. Is this the case with a PSU?

SLI mobos only make sense if you buy 2 cards right off the bat. A lot of SLI users buy one ok gpu & an overpriced nvidia mobo, and then they couldn't upgrade to a 2nd gpu cuz either it's discontinued or no longer economical. The only reason to go SLI is if you get 2 gpu's right away for less than an equivalent single gpu or braggin right. you don't seem to be in either category.

You're right though, but keep in mind there's a time limit to the step-up.

The best Intel for about $300 US would be X48. After tax, it'll be over budget. GIGABYTE GA-X48-DQ6 or ASUS RAMPAGE FORMULA. My vote goes to DQ6 for easy overclocking. Or X38 for about $80 less. Look at ASUS P5E.