Yeah, those InWin cases are loud. I ran a BP-series one fanless for a while, but the PSU fan got loud too. Gave up on it.
If you don't mind a big case, that's 19" width, the Silverstone Milo ML03 is good - it's quiet, and can fit microATX boards. It's the same size as normal hifi equipment.http://www.silverstonetek.com/product.php?pid=283
I ran a Pentium G620 on an MSI H77 board, with a GT610 in one, no problems, cooled by a 80mm Scythe fan on the CPU and a single 80mm Scythe fan in the case. It was very quiet, and ran cool.