First attempt, anything seriously wrong here?
CASE (Â£140.98 )http://www.scan.co.uk/Products/Silverst ... Full-Slots
If you game at night it may be more than a bit too noisy (far from any Mac-mini), as almost every small cube-sized hig power ITX systems.
But moreover the PSU isn't modular: you mandatory need (IMO) a fully modular PSU, like Seasonic X-series, in a small sized high performance ITX system, in order to not to destruct the airflow.
If you want to stick with m-ITX form factor, the Lian Li PC Q08 (and even the smaller PC Q07) could be a viable alternative, expecially if coupled with a Seasonic X-FL PSU.
If you don't mind to go with a ÂµATX mobo, there's even more choice: Lian Li V351/352/354 or LanGear DABox could be either good options.
However, the SG07 isn't that bad: but to me it could not be enough quiet to game at night (and it's a bit pricey for its overall quality).
First of all, afaik DFI is dismissing its LanParty line, exiting from enthusiast/retail market.
Thereafter, as every LanParty it is not particularly power efficient: besides being fairly hot, it could also turn out to be incompatible with your PSU (it's a rather common issue with DFI boards, even if Silverstone is a brand their support service recommend and the SG07 PSU declare 3A on 5Vsb which is the minimum for most of current DFI boards).
It should has a very good BIOS, if you overclock/tune your systems.
For a quiet PC I mean there are better alternatives, generally speaking.
If you don't mind Turbo Mode, the i3-560 should be nicer.
If you mind, the i5-661 also should be nicer.
If you overclock, the i5-655K is the way to go.
If you aren't in hurry and likely won't overclock, it could be advisable to sit and wait for the forthcoming Intel 1155 (Sandy Bridge, there's an interesting preview on AnadTech).
There are surely far better performers among quiet heatsinks: several Scythes, some Thermalright, give a look in the cooling section of SPCR.
It's the old one, and in fact it comes at a discount price.
Moreover, probably it isn't enough big to act as the only drive in town, and too big to find better performing (more modern) alternatives (such as Corsair Force, OCZ Agility 2, OCZ Vertex 2 Extended) at comparable prices.
All that also means it could be a decent trade off.
If you'll find, a PowerColor Go Green more probably that not will heat up less your system (as it does not sport the PCI-E connector).
But in a very cramped space I probably won't get a passive card, but things such as the MSI 5770 Hawk, or the MSI GTX460 Cyclone: expecially if you stick up with the SG07 I bet that you very hardly will ever hear them.