I also already have an external HDD and an SSD (internal).
So, as you can see, I'm getting the Fractal R3... so I'm going for quietness. I'm also on a budget. Now, I'll be overclocking my components, so they are going to need some more cooling. Here's some relevant info:
- It'll be on carpet
- It'll be on the ground (duh), possibly/probably under a desk
- The average temps at my house are 70F, but can get up to 80F in the summer
- No side fans. They increase noise by a lot
- The desktop will not be near a wall (exhaust won't go into the wall)
- There is a fair amount of dust
So, I'm going to need a high-pressure system. I'm thinking of adding one more intake above the stock intake and calling it a day (using a Cougar 140mm fan). However, will this be sufficient? I'm wary of adding more, since I need it to be quiet. I could put it under a desk, so the top fans would be a little muffled, but the desk is hard (wooden), so the sound would bounce off (into carpet, but it wouldn't exactly get muffled much). What would you suggest?
Your planning seems solid to me. A lot of people will tell you to put your case on a solid surface, and while that may offer some airflow improvement, I don't think having your system on carpet will hurt you. My system is on carpet, and my airflow and temps are fine.
I'm in a similar boat as you -- going for a quiet build. I picked up an Antec P280, and I'm using the stock case cooling (no side fans) with a Corsair Hydro H100 for CPU cooling. My room environment is similar to yours (system under the desk, similar ambient temps, etc.), and cooling is fine. The system is also very quiet. I've got my PSU fan pointing down, blowing to the bottom of the case.
The best recommendation I can offer is stick with your current plan and then check your temps once you've got everything put together -- especially if you're planning on overclocking. The components you are using in your build are all solid, so I don't think you'll run into any trouble. You can also pick up additional fans in the future if your temps are a problem.
I have the R3 running a 2500k @ 4.5ghz with 2 GTX 560 ti 448 cores in SLI, and system temp is around 29C. My gpu's idle @ around 40C and 35C at 50% fan speed. I have 1 intake at the top, 2 intakes in the front, and an exhaust in a push-pull at the rear. 3 of the 4 fans are Gelid Wing 120mm's and they are relatively quiet, but kind of expensive. I don't know if this is the best arrangement of fans, but this might give you an idea?
lol, at most you'll hear the sound of the air flowing through the case. You'll barely hear it granted you put silent fans in there as well.
I personally am not hellbent on getting mine completely silent. My computer is in my room, and I normally have the chassis fans set at full speed with the side panel off. I have no problem sleeping at night with it on. Maybe that helps?
Actually, it does... a lot! Last question: what do you mean by having a "push pull exhaust" fan? One fan can only either push or pull, last time I checked... right? Or do you mean that the top fan pulls air in and the back fan pushes it out again?
As long as you dont have any bottom ( floor ) mounted fans like the http://www.newegg.com/Product/Product.aspx?Item=N82E168... you'll be fine on the carpet as far as airflow is concerned . The cougar fans run quiet so that should be good as well . Depending on your fan speed you may still here the air being drawn in through the intake . Whoosh is ok .. its the whirr and whine of cheap fans to be avoided and as emubite said check your temps once your up and running .. best of luck