It's not all compatible, and the value is terrible. If you want SLI you must have a motherboard based on an nVidia chipset, for that CPU you need 750i/780i or 790i SLI chipset. If you want to use Vista do not get a Creative soundcard, there are lots of driver issues still. The power supply is overkill, you can't make a gaming system that would draw over 750W full load(even tri-SLI 8800Ultras or dual 9800GX2s). I'd drop the power supply down to a Corsair TX750 or PC Power and Cooling Silencer 750. DDR3 at that low of a speed is not going to be a noticeable improvement over DDR2, to really benefit from DDR3 you would want at least DDR3-1600. You would be better off getting 4GB of high quality DDR2 and a 780i SLI motherboard.
^PSU is cr@p. Get a PP&C or a Corsair or better.
Drop the Raptors and wait for the new VelociRaptors.
Try and get good DDR2 800 RAM (ie Crucial Ballastix DDR2 800) becase RAM natively higher than DDR2 800 seems to have compatibility issues. Be careful with liquid cooling, make sure you know what you are doing and the cooling system is high quality, you DO NOT want a low quality liquid cooling system. If you are not OCing most (ie CPU/Motherboard) is an overkill.
Drop the Kandalf LCS.........A good air heatsink will beat that Thermaltake crap, and for alot less money too. Get something like a Noctua NF-U12P heatsink......very good, very quiet, easy to install, decent price.
That sound card is good. But just for the record, the X-Fi's do run on Vista, I'm on one now. They can have "issues", but so do Nvidia and ATI graphics cards, and so on. Point being is that while they had problems, the new drivers (and DanielK's if you want) actually work well. I'm not argue semantics though, the bottom line is they do work "fine". But that ASUS card is definitely a good alternative.
Do you need a Blu-Ray drive?
Do you need 2x150gb Raptors? Or can you wait just a little while for the Velociraptor to come out? It'll be the same capacity as 2 - 150's, be faster and cheaper. Something to consider..........
ASUS P5E3 Premium/WiFi-AP support Core 2 Quad Processor Q9450.
Product Description ASUS P5E3 Premium/WiFi-AP - ATX - iX48
Product Type Motherboard
Form Factor ATX
Dimensions (WxDxH) 30.5 cm x 24.4 cm
Chipset Type Intel X48 Express / Intel ICH9R
Multi-Core Support Dual-Core / QUAD-core