EU user, Help building rig from overclockers.co.uk

[wangboy]

I've seen lots of Newegg shopping lists and it's fair to say they are a help but not always so relevant to the Euro market.

This is what I'm thinking of buying to put together my rig and just looking for some comments/suggestions.
I'm shipping them to Finland so if anyone knows any better stores that will ship here feel free to link to products in them
( I think there may be some German stores which do but I've never heard of them I've tried one of the dutch or belgian computer stores but no luck and Finnish stores are more expensive than UK for sure)

Motherboard
This is where I'm not so sure about some things. I understand it needs to have four pci-e slots if I'm to run four graphics cards off it.
What I'm not 100% sure is so they all need to be x16 slots or will a card with 2 x16 and 2 x8 or x1 slots work?

For example will this board work
MSI 870A Fuzion Power Edition (Socket AM3) DDR3 PCI-Express ATX Motherboard
http://www.overclockers.co.uk/showproduct.php?prodid=MB-164-MS&groupid=701&catid=1903&subcat=

CPU
Cheap and cheerful AMD Sempron 140 2.70GHz (Socket AM3) Processor : £24.98
http://www.overclockers.co.uk/showproduct.php?prodid=CP-272-AM&groupid=701&catid=6&subcat=1942

RAM
Corsair Value 2GB (1x2GB) DDR3 PC3-10666C9 1333MHz Low-Voltage Single Channel Module : £26.99
http://www.overclockers.co.uk/showproduct.php?prodid=MY-296-CS

PSU
Antec High Current Gamer 900W Quad Rail Power Supply : £99.98
http://www.overclockers.co.uk/showproduct.php?prodid=CA-150-AN&groupid=701&catid=123&subcat=

GPU
Sapphire ATI Radeon HD 5850 Extreme 1024MB GDDR5 PCI-Express Graphics Card : £114.95 X 3 = 344.85
http://www.overclockers.co.uk/showproduct.php?prodid=GX-259-SP&groupid=701&catid=56&subcat=1711

I'll use a flash drive I have to boot from.

Total ex Motherboard = £496.80 = Euro 552.94

Just a note or two, I realise I've only included 3 GPU's in my list, I'm working with a budget of 700 Euro and would like to build a rig that will allow me to add an extra card easily when I get a bit of cash to do so and I can see the motherboard being at least 150 so if that was the case I would be coming in at just about 700.

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[wangboy]

I've hit a slight bug here.

Each graphics card need's 2 6 pin pci-e connectors while my pssu only has 4 (6+2)-pin PCI-E connectors.

I guess this means I need to find a PSU with 8 connectors if I want to run 4 cards off it ??

Sorry if this seems a stupid question

[MiningBuddy]

I've hit a slight bug here.

Each graphics card need's 2 6 pin pci-e connectors while my pssu only has 4 (6+2)-pin PCI-E connectors.

I guess this means I need to find a PSU with 8 connectors if I want to run 4 cards off it ??

Sorry if this seems a stupid question

You can use splitters to make up for the pci-e connectors you are short of (the are only a few $'s each), or use molex adaptors.
Though be careful with the molex version as I've heard some horror stories of cables melting under load.