$30 - Hyper 212+
$50 - Scythe Mugen 2 (extra $20 gets you about 5 - 7C over the 212+)
$80 - Thermaltake Silver Arrow (extra $30 gets you about 7 - 10C over the 212+)
When you look at sites which list records and comparative testing information, make sure that you are using the same socket type. Different sockets will have different CPU's with completely different heat signatures and this information id not transferable to other socket types.
Looking at Frostytech for example, if you have these, you have found agreat site to mine data on:
http://www.frostytech.com/testmethod_mk2.cfm
Mk.II Synthetic Thermal Test Platform - AMD K8 Version
Mk.II Synthetic Thermal Test Platform - Intel LGA775 Version
But as you can see by comparing results on other sites, a unit that does well on LGA 775 might do much less so on 1366/1155 and visa versa.