I don't know about OP, but I've found that one of these makes them cool enough to touch without any difficulty.  From what I've seen from others, its a pretty standard fan to use on these setups.  Newegg is currently out of stock, but they're also available on amazon - for about twice as much.

Mine are using the OP's configuration (minus the custom cgminer) and are holding steady at about 397MH/s.




Most setups look more like this:

Mine will too - eventually.