New build, Need help with MoBo and PSU

Hello,

I am building a Dual core, watercooled computer (Don't want quad core). I will be overclocking past 4 Ghz for daily use.

I will not be upgrading this, I will replace it with something new in 2 - 3 years. So not worried about upgrade ability.

I will be playing FPS games and doing nothing else on the system.

I already have:
1680x1050 Monitor, Soundcard, Raptor HDD @ 10k, Z5500 Speakers, Windows XP Pro 32bit

I need a lot of help picking a MoBo, because it's my toughest issue...

Here is what I have picked so far:

Intel Core 2 Duo E8600 Wolfdale 3.33GHz LGA 775 65W Hopefully E0 Stepping
$270

GPU + RAM:
EVGA 01G-P3-N891-AR GeForce 9800 GX2 1GB (512MB per GPU)
NEWEGG COMBO WITH:
OCZ Reaper HPC 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500)
$398 - $30 MIR = $368!

That's $638 for the Ram, CPU, and GPU, I think it's a fair amount of performance considering a 4Ghz Overclock for that price? I could change the RAM if someone has a better performance suggestion.

CASE + POWER SUPPLY:
Thermaltake ArmorPlus(Armor+) VH6000BWS Black Aluminum
NEWEGG COMBO WITH:
Thermaltake toughpower W0117RU 750W ATX12V / EPS12V
$395 - 15 Instant - $80 Combo Instant = $300 - $30 MIR - $50 MIR = $220


750 should be more then enough with a watercooling setup I would think, right?

Total Price w/o Rebates: $967.95
Mail In Rebates: $110.00
New total = $858


BTW: All the benchmarks I have seen lately put the 9800 gx2 outperforming single GTX280 and 4870x2, which is why I picked it.

So, Which MoBo should I get?
Should I change RAM?
Thoughts on Power Supply?

I read all of the reviews on both of those boards, and there was some skepticism about whether or not they were capable on a consistent basis of going over 4Ghz.

I am just very limited in MoBo knowledge. All that I can go by is other people's Reviews.

If needed I can spend up to $250 or $300 on the MoBo, I just need something that I CAN go over 4Ghz with stability.

* I updated my post to reflect an awesome deal with the Thermaltake Armor case accompanied by a Toughpower 750W P/S.

New total cost for system after rebates is only $858 w/o a MoBo. Almost feel like I HAVE to spend more since I set out to spend $2000, but oh well!

Much respect dirtmountain, I read a lot of your posts

I currently have a gaming setup that's a bit out of date, so I am going to use my peripherals from that, such as the LCD monitor, Z5500 speakers, headset, printer, razer mouse and keyboard, etc.

When I mention the price, I don't include the watercooling setup I am going with... Which is probably going to be on the order of $400 or $500 (I have 2 setups in mind ATM), since I actually plan on recycling the WCing to the next PC I get.

I just wanted to upgrade to something that can handle today's games that will carry me for a few years on a firm overclock. Most of my problem with my current system was that I haven't had enough time to use it. First year I was on it constantly, but I have succumbed to the life of a workaholic and want to make sure I am back in it before I drop the dough on the latest and greatest.

I am personally a little wary of BIOSTAR boards simply due to personal issues I and a friend have had before...