Best fans for this CPU & Case?

I have a Thermaltake Commander MS-I ID VN400A1W2N Black SECC ATX Mid Tower case with an AMD Phenom II X6 1090T Thuban processor (AM3 socket) overclocked to 3.7GHz and an ASUS M4N68T-M V2 motherboard.

I was wondering what CPU fan would be best to replace the stock fan considering the case I am using? Should I get any additional fans for the case besides the included one?

Links to case and processor:

http://www.newegg.com/Product/Product.aspx?Item=N82E16811133190 - Case

http://www.newegg.com/Product/Product.aspx?Item=N82E16819103849 - Processor

I actually use this case also, with the build i have in my sig. I use a Scythe Slimline 120mm fan on the top towards the front as an intake , the whole to the rear on the top i kept open. I used 2 Scythe Ultra Kase in a push pull on my cooler, 266 cfm and let me tell you it cools like a champ. I use another ultra Kase on the bottom as an intake. I use 2 Rosewill 120mm blue led fans they both move 87.5 cfm, 1 on the front behind the Thermaltake badge and i use the other and an exhaust. I use foam fan filters on my fans and have no problems with dust or cooling, it cools great i couldnt ask for any better. Its a positive flow case, oops i also forgot i use the stock Coolermaster fan that came on the Hyper 212 evo as a side fan, the Vent on the side fits the fan perfectly. All hooked up to a 4 channel fan controller in my 3.5 bay. All the Ultra Kase can get noisy without a fan controller. Here is a link to the fans i use. My temps at idle are 32 and maxed with prime 95 never over 44.
http://www.newegg.com/Product/Product.aspx?Item=N82E16835185139
http://www.newegg.com/Product/Product.aspx?Item=N82E16835185054
http://www.newegg.com/Product/Product.aspx?Item=N82E16835200028

The fan that comes with the case is junk, you need to get rid of it asap, its not powerful at all. Mine stopped working after 1 week.