Which isn't to disparage ThermalTake. I recently got a chance to build a new Core i7 2600K system in one of their uber-deluxe $300 cases. They also sent a monster 850W PSU to go in it and some other goodies tot he guy I was helping on his review. Bloody amazing design and quality. Still noisier than I'd want for a machine to be running while I sleep nearby it was like I'd imagine it feels like to work on one of those supercars on Top Gear.
The i7 2600k is not a supercar, if you want to relate this in terms of cars, the 2600k is like an EVO and STI; good decent power that anyone can afford. Want supercar computer, that's where the 2011 SB-E chips are for, with 3 or 4 gpu setup. Just helped built a sweet triple 680 rig for one of my clanmates; He's sad though because he can't get water blocks for them yet.
As for LED fans, you can disable LED's fairly easy on most models. They are powered by the 5v rail, the fan motor is powered by the 12v so in theory you can disable them; either that or just replace the fans if you don't want to mess with them.
OP: what HAF case do you have? I'd look at either a simple fan controller to help mitigate noise levels with cooling when idling if the noise is coming from the fans;
either that or replace your 120/140mm fans with ball bearing/Hydro-Dynamic type fans that should help reduce overall annoying noises from the motor compared to the cheap sleeve designed fans that most cases come with. Cougar makes some really nice fans that are very silent, but still push a large amount of air; very pricey though. Scythe would also be on the top of my list for high end fans, but again, pricey.
You can also look at the cheaper Rosewill 2 Ball or Hydro Dynamic fans; which are a good bit cheaper and just as quiet, although they may not push as much air as some other fans that use similar motor's. Still, I recommend them as they are more or less 1/2 the price of similar products.