First what case do you have? (If you want aircooling this will help me determine how big you can go)
If you want an all in one water setup do you have room for a single or double radiator?
The best aircooler is the Noctua dh14.. but it is huge and heavy.... If you only have room for a single radiator, I would get something like the antec 920 or thermaltake water 2.0 that has the double thick radiator.
On another note if your temps are now staying at under 30 then i...