Noctua are easily the best but god are they ugly! Lol why I went with corsair and led's
Which Corsair fans are you using? I'm considering to get 2 of those 120mm high performance& air flow ones as top exhaust. But still trying to make up my mind. My other options are Thermalright TY 143 (or 147) and Aerocool Shark 140. Noctua is very expensive here and never seen Arctic Cooling, Cougar and Scythe around for a long time...
I went for 2 SP120 high performance edition to put on top as intake(push) and AF 120 quiet edition to be placed at the rear.
I went and ordered BitFenix Spectre Pro 200m since they're the only thing that looks nice and performance great.
question about the corsairs' though, should I get the PWM version or the ordinary one's?
Personal choice, as well as dependent on your motherboard. If you have a lot of 4-pin PWM fan headers, get the PWM variants. If you have three-pin headers that are capable of voltage control, you'll be fine there too.
If you have a hardware fan controller, it won't matter, unless you have a fan controller than is not compatible with 4-pin fans.
For 120mm Cooler Master Jet FLo is really good, it is PWM and i use it,
for 200mm Cooler MAster Mega FLow is good but it is 3 pin and i use it.
Not much 200mm are out there performing good but for 120mm Jettflo is the best that i have ever used.
I own a 600T case as well.
I changed the top 200mm fan with 2 140mm noctua fans.
However, you won't be able to change the front 200mm fan... It has irregular dimensions (thiner than usual - 20mm) so other 200mm fans just won't fit (BitFenix Spectre Pro are 25mm thick).