Building new home Workstation for 3D/2D/Animation

Hello

So I have finally made my mind and I'm ready to posy my spec here... I've seen also that there are few other members here that made simmilar pc's...but I cant get hold on them...so well I'm posting here The PC will be mainly for Graphic... 3D/2D/Animation/Modeling/Rendering/Etc etc But I also want to play some top end games in freetime... It might happen that I'm gona work on some games soon so I gotta be able to use the max of games too to test if all is ok...

MOBO
Asus Serverboard Z8pe-d18
http://www.techstore.co.uk/detail_147126.html

CASE
Its 1 of them... I cant make up my mind...
http://www.newegg.com/Product/Prod [...] 6811133021
http://www.newegg.com/Product/Prod [...] 6811119138
http://www.newegg.com/Product/Prod [...] 6811129043

Processor
Intel Nehelem E5520 OR 5530 Depends..what you think I should take? (I also want to do some gamming in free time off 3D)
http://www.techstore.co.uk/browse. [...] eID=148634

Memory
I got big problem with this 1...coz they quite expensive...wots better 3x4 GB or 6x2GB?
http://www.crucial.com/uk/store/pa [...] 1272BV1339
Crucial 12 GB kit

Graphic Card
Evga GTF 295
http://www.novatech.co.uk/novatech [...] 95-ER.html

PSU
Well theres another problem... I read somewhere on forum that I cant use normal PSU for server boards with dual socket...they need specific line 12v or somethink lilke that...can any1 help me with this bit?
150-200£

HDD
Western Digital RE3 500 GB 2x
http://www.dclstore.co.uk/desc-wes [...] -2908.aspx
I'm thinking of making them into RAID...but never did it before so <help>

Now the last part....Cooling...well I could invest from 100-200£ on 2 coolers for xeons... I'd like to do a lil tiny OC on them if the mobo gona let me... I want to reach 2.5-3ghz core speed to somethink I got now...(old q6600 that works easily on 3ghz and even 3.5 if I increase v)


well as you can see....I pick up these parts from random webs... so if you know any UK Shop that could get me this set I'd love u to the rest of my life....I spend 2 weeks on googling and pof...nothink....

Thanx and bey