first build, nice, small form factor, intel i5

[M_A]

So basically this will be my first build, I want it to be fairly small but not too constrained, was thinking mini ITX with a fairly roomy case. It's not for games so nothing beastly, but I do want something nice and that will last a while.

CPU - i5 3570K (~£175)
aria.co.uk
MOBO - not too sure something with z77 chipset, probably a mini-ITX (~£135)
mini-itx.com/
GPU - again not sure, not a gamer but would like something nice anyway

RAM - Corsair 8GB DDR3 1866Mhz Vengeance Memory
ebuyer.com
SSD - 120GB OCZ Vertex 3 2.5in SATA 6Gb/s Solid State Disk, (~£90)
mini-itx.com
HDD - 750GB Seagate 2.5in SATA 7200RPM/16MB Cache Hard Drive (~£70)
mini-itx.com
Case - BitFenix Prodigy Mini-ITX Cube Case, only if I get a mini-ITX MOBO obviously. (~£60)
overclockers.co.uk

I would like to keep it around the £500 mark so I might cut on some of the above, but there is room for negotiation where the budget is concerned. I'll still need a monitor, keyboard and mouse and not sure if I'll want a separate sound card, tv card etc... and of course power supply!
to summarize all I really know is I want something nice, smallish, and quiet based round the i5 3570k
sorry if this is all a bit vague or foolish, I'd appreciate any advice on this.
thanks,

[Pob255]

Depends on what you want to use it for, for a general internet/office type pc I'd say drop down to an i3 2120 it's got plenty of power for the majority of most pc usage

Motherboard, I'd look at the Zotac boards, they are not always the cheapest but they are some of the best mini-itx boards IMO

I'd say look at the new coolermaster elite 120, it might not be quite to your taste, it's very new still so there's not a great deal of solid reviews on it yet and it is cheap for a mini-itx case
The other thing to look for is a Lian-li pc-q07 it's a bit more limited as to what you can put in it but it is very small while still being able to fit a standard 5.25" optical drive and ATX psu, even a single slot graphics card.

The big issue with the BitFenix Prodigy is that it's rather large as mini-itx cases go, it does allow for things like very large cpu coolers or watercooling in a mini-itx case