I have a Alpha PAL 8045 with a PC Power and Cooling Silencer 20 db @27 cfm. I love this combo, but you have to be careful because the 8045 doesn't fit some mobos. The Papst 80 mm fan is also a excellent and quiet option for the Alpha 8045, but the fan is $20. This isn't the cheapest option either. The bare HS will run you $30-$35 and the fan will run between $10-$20 typically.
The biggest bang for the buck would have to be the SVC GC68 and Panaflo L1a combo. The fan is on par with the PC Power and Cooling Silencer in noise and cfm, but cost under $5 at most places these days. The SVC does a good job too from what I hear and it's cheap.
It looks like you want good and cheap, so I would suggest going to
Svcompucycle, ordering the SVC GC68 (comes with a cheap fan that you can discard) and add a Panaflo L1a to your cart.
Sal