The Noctua is a decent cooler, in fact anything by Noctua is decent, just expensive. For what you need, a 550W PSU is all you need. Something like the
Antec Truepower 550W or the
EVGA GS 550W/
XFX XTR 550W if you want a modular unit, will be more than you'll ever need, even with an OC'd 6600K and graphics card (which you won't be doing as it's a non-K 6600 and you've got a Quadro).
You're going to have to reinstall Windows regardless. Your existing sytem uses a completely different chipset and drivers compared to what you're going to be upgrading to. You can use a backup drive to restore all your documents, but you
WILL have to reinstall Windows.
This is all such a bad idea... That case has nearly zero ventilation and you want to put a 90+W TDP CPU in it? It's just a bad move.
Please get yourself a proper case and power supply. If you need a new windows license you can get it for about 25 quid from kingwin.net.
Yes your existing case is pretty poor for ventilation and may not fit a modern ATX PSU. That Coolermaster case does have slightly better ventilation, but it's still not that great. TBH no m-ATX case has excellent ventillation and they're a pain to fit everything into.
My dad as one of
these on his desk (I set it up for him). Whilst it's probably bigger than what you already have, it handles an FX 6300 (95W TDP) and HD 7950 no problem and is quiet as well. These have a combined thermal output higher than what you're going to be using.
You will need to buy a new Windows licence if the existing one refuses to co-operate (which is very likely).
As far as kingwin.net/cheap Windows keys goes, personally no. Although this may be totally legit (I've never used this site), I would buy a new, guaranteed genuine licence. Especially if you're going to use it for work purposes/wor is buying it. Windows 10 is very easy to download from Microsoft.
