I am planning on using the same case and CPU, but with a standard PSU, one 2TB Hitachi Coolspin hard disk in addition to the SSD, and a Hauppauge Colossus card.
My plan for cooling is to use the stock heatsink/fan, and replace the left and right forward 120mm fans with Noctua NF-S12B FLX fans set for either probably 600 or possibly 900 rpm, and a Scythe Kama Flex SA1225FDB12H-P PWM fan in the back right position controlled by the MB's PWM controller to provide some extra cooling just in case anything warms up ever. I'm hoping this will produce no discernable noise while keeping everything nice and cool.
In which of the fan locations are you planning on putting your one fan, and are you going to have it blow inward or exhaust? I would think adding the heat of a video card (and disrupting the air flow with that card) would change significantly the calculus of whether the single low-speed fan/passive cooling will be enough. Have you thought about using a i3-2100T? I would think that would further reduce your heat level.
I'd chosen the Noctua fans because they can be set at one of three speeds, as low as 600 RPM, but after seeing your post I noticed that the Scythe Kaze Jyuni can be set at 5 speeds, as low as 500rpm, and are less than half the price of the Noctuas, so I may change what I buy for those two fixed-speed fans.
My thinking was that having the one PWM controlled fan blowing over the motherboard in the right rear location would provide some extra cooling if things warm up (at the expense of extra noise) but I'm hoping it will run at a slow, silent speed most or all of the time. I was going to have all three fans blow inward as Silverstone designed it, with the exhaust passively out the back of the case. My expectation is that if the fixed fan speeds are low enough, and enough air is circulated to keep the temp down low enough so that the CPU and PWM fan don't speed up, then it should be essentially silent. Is this idea crazy? I probably won't know until I try it.
One other question - would using G.Skill Eco 1.35v instead of 1.5v Ripjaws X memory have any discernable impact on the heat?
My build looks like this:
Case - Silverstone GD04B
PSU - FSP Group Aurum Gold 400
MB - Intel DH67BLB3
CPU - Intel i3-2100
Cooler - stock
SDRAM - G.SKILL Ripjaws X Series (2 x 2GB)
SSD - Samsung 470 Series 64GB SATA II
HD - Hitachi Deskstar Coolspin 2TB SATA III Hard Drive 0F12117
BD - LG WH12LS30 12x Blu Ray Burner
Fan 1- Scythe Kama Flex SA1225FDB12H-P
Fan 2&3 - Noctua NF-S12B FLX 120mm
Video Capture - Hauppauge Colossus
Keyboard - Lenovo N5901