Your basic "decent" (IMO) three options are these:
Antec Spot-fan (nice picture Syrillian)
Dominator Airflow (good call smokey)
and my personal favorite:
*which I actually prefer to the AirFlow- I think it is constructed better, isn't nearly as tall (airflow concern)-the fans are quieter, and, also it's more aestheticaly pleasing) (especialy if you strip it and paint it Black)
I guess it depends:
are your 1600's the PI version?
If they are, then the XTC will not fit, and you have
to go for the Airflow or spotcool.
again, this is personal opinion:
I think the spotcool is a great versatile fan- but, I think it is much better suited to a "test-bench" setup than it is inside a case (especially a windowed one)!
Don't you want a fan thats just sits over your RAM and is not blocking the view of all your uber parts and pretty cable management (you did do your cable management, Right?).