OK so I have a lot of money to spend

And I want to build a nice shiny new sandy bridge system to replace my 3-year-old laptop; something that can basically destroy any game I throw at it. ATM I'm having to tweak settings a lot to get things to run smoothly at 1920x1200 and some games don't run at all (e.g. Mass Effect) because of my lousy CPU. Cost is not so much of an issue, but obviously I want to keep it down as much as possible whilst still getting maximum gaming performance.
Here's what I have so far:
Case:
Lian Li PC-8FIB Aluminium Midi Tower Case - Black
Motherboard:
MSI P67A-GD65 Intel P67 (Socket 1155) DDR3 Motherboard
Processor:
Intel Core i7-2600K 3.40GHz (Sandybridge) Socket LGA1155 Processor with FREE Lost Planet 2 PC Game - Retail
Cooling:
Corsair Hydro H50-1 High-Performance CPU Watercooler
Memory:
Corsair Dominator GT 6GB (3x2GB) DDR3 PC3-16000C8 2000MHz Triple Channel Kit
Graphics Card:
Gainward GeForce GTX 580 1536MB GDDR5 PCI-Express Graphics Card
Hard Drive:
Crucial RealSSD C300 64GB 2.5" SATA 6Gb/s Solid State Hard Drive
Edit: Noticed that this is 2.5".... are there comparable 3.5" drives? Or adapters? Western Digital Caviar Blue 500GB SATA-II 16MB Cache - OEM
PSU:
Antec TruePower New Modular 650W Power Supply
Disk Drive:
Samsung SH-B123L/RSBP 12x BD-ROM / 16x DVD Writer Drive - Black (Retail)
Monitor:
LG W2363D 23" TRUE 120Hz 3D Widescreen LCD Monitor - Black
OS:
Microsoft Windows 7 Home Premium 64-Bit - OEM
Now all told this comes to about £1900, but I've not searched around for prices. So now some questions:
Is the SSD worth it or should I just get two of the 500GB WD drives in RAID 0 since they are dirt cheap?
Is the RAM worth the money or should I get cheaper/slower RAM possibly with more than 6GB?
Is water cooling beneficial for the 2600K (I read one review where it seemed it was not much more beneficial than air?) (but the water cooling system is not very expensive anyway)
What is the difference between different makes of graphics cards if any, is that a good choice?
Worth it to go for the 120hz/3D monitor? (It will be a slight step down in resolution for me and it is not tremendously cheap)
I will need a keyboard but I am happy with my G9 laser mouse and my logitech speakers, also need a network card but they are cheap.
I have compiled this list on the overclockers uk website, are they a good vendor? (Quick delivery times, good service etc.)
General criticisms/have I been an idiot and left something important out
In the past I have always bought pre-built systems and upgraded them, so when this stuff arrives I'll probably come back for help
<message edited by thor on Saturday, January 08, 2011 11:26 AM>