Cooler Master Hyper 212 Evo (if it will fit in your case). It's not exactly pretty (nor does it have any blue in it whatsoever), but you can't beat its performance for the price.
If you HAVE to, you could find a nice blue LED fan to use with it.
Actually that looks good enough (Just googled its image) to me and i think it would fit my case which is a Cooler Master Elite 430 Black ATX/MicroATX Full Tower. How much do they cost ?