Sorry I didn't see your thread and respond sooner.
I have a Scythe Infinity on an Asus P5N-E SLI in an Antec TX640B
, which is almost exactly the same size and internal layout as your Sonata
, and it is a REALLY tight fit. There's only 3/4 of an inch between the "top" (the side facing up when it's mounted in the case) of the cooler and the bottom of the power supply and it almost touches that horizontal brace.
One of the great strengths of the Infinity is the ability to get great cooling with very low noise by mounting two low speed fans on opposite sides of the cooler in a push-pull configuration. Unfortunately, in this case there's not room to do that.
If I had to do it over again (in this in computer case), I'd buy one of the better downdraft coolers instead. Although not as capable as the Infinity in a perfect setup, even in small cases like we have you can to duct cold air from outside the case directly to a downdraft cooler (not possible with the Infinity). I think this would give a good downdraft cooler the edge over the Infinity with a single fan in a TX640B or a Sonata and it would be cheaper too.
As of now, I'm looking for a good price on a bigger case with a bottom mounted power supply so I can mount two fans on my infinity in a bottom-to-top push-pull configuration. I'm sorry to say that I missed the Memorial day deal on the Antec P180B at CompUSA.
BTW, If you decide to go with the Infinity anyway, be sure to checkout this
mod. It lowered my load temps and is much more secure.
Best of luck.