Advice on a new, near-silent setup please

I'm looking to build a very quiet setup and would really appreciate the advice of you Silent PC gurus on some part selections.

Basically, I don't really get time to play games these days so I'm looking to change my sig rig into a quiet system that's capable of running 24/7. I'm also trying to do this on a pretty small budget, I've got a little bit of cash put to one side plus whatever I can get by selling components I no longer require.

What I plan do with the main components is replace to the motherboard with a low end Z77 board (for possible ivy-bridge upgrades in future) and run my 2600K at either stock or a small overclock to about 4.5ghz. I think I will be looking for a different, quieter CPU Cooling solution to my Silver Arrow.

I'll be selling my GTX 480's and will be looking for a card for less than £150 which is ideal for running my PC through my 40" Samsung TV. I was hoping to hold out for a GTX 660 but I've heard rumours that this card could be a long way off yet.

I will be keeping my SSD as a boot drive but replacing the WD Blacks for a 3TB WD Green as a storage drive, I would be interested to hear any silencing HDD Caddy recommendations.

I will also be selling my AX1200 PSU in favour of a quieter model that's less powerful (been thinking about the Be Quiet 750W Dark Power Pro).

Finally I'm looking for a new, quieter case and system fans. I really like the look of the CM Silencio RC-550 or Fractal Design R3.
I should also state that I'm not overly keen on the idea of a fan controller as these tend to have lots of lights which is a real put-off as this computer is in my bedroom and I don't want them illuminating the room whilst I'm trying to sleep.

I would also be interested to hear in any other silencing methods you recommend such as foam padding.

Any help and advice would be greatly appreciated. Thanks in advance!
Edited by Jay Scott - 5/6/12 at 2:10pm

Thanks for your reply Farih.

Unfortunately I don't think water cooling is real option for me due to budget constraints (I should have stated this in my OP), I also don't have any experience with water cooling and I'm not confident with regards to installing a WC setup and performing the relevant maintenance.

I would be interested in a quiet aftermarket graphics cooler, I wasn't sure whether it was worth keeping hold of my 480's as they are hot, power hungry cards, I thought perhaps a newer, less powerful card would serve me better in this case?

Your point about the PSU's which shut down their fans is very interesting, I wasnt aware of this feature on PSU's.

I'm also not too keen on idea of the fan controller, mainly due to the fact these usually have lots of lights on the front and I would like to keep my case as discreet and light-free as possible. This is just because the PC is in my bedroom and previous fan controllers and case lights I've had have lit up my room while I've been trying to sleep!
Edited by Jay Scott - 5/6/12 at 2:11pm

Thanks for your reply. I guess I just have my fans on the wrong setting for the Silver Arrow, do you think its worth swapping out the Thermalright fans that come with it for some quieter ones? Also is there a consensus as to whether I should be using 1, 2 or 3 fans with it?

I was planning to go with an Asus Z77 board, I like the look of the Sabertooth but that will depend on whether or not budget permits. As for the Power Supplies, I like the look of the ones you have recommended but are the likely to run at less that 20% load, and thus fanless if I plan to run a GTX 660 or similar in my system?

Do you have any recommendations for cases, case fans and HDD silencing solutions?

Thanks again for your advice mate.

I've come up with this shopping list for my new quiet system. I'd like to hear your thoughts on what I've chosen and whether I need to change anything or if I've missed anything.

It should be noted I'll be using my current CPU, Cooler, RAM, SSD, Sound Card and my GTX 480's have actually been sold so I will be running on-board video until I can get a GTX660 or similar.

I also noticed that quite a substantial amount is going on fans here, is there a more cost effective alternatives to Gentle Typhoons or Slipstreams?