I have the SLK -700 version of the heatsinks you are talking about on the same board you have, the A7N8X Deluxe, and have alot of experience with the SLK line in general....
Mine is on an oveclocked 2500+ with a speed adjustable fan...
I highly recommend this line of heatsinks (Thermalright SLK line that is...)
And very much suggest you get a speed adjustable fan, the largest your Heatsink holds.
There is no problem with board clearance with these Heatsinks when talking about the Asus board you have.
I can suggest another source for purchasing these HS's and fans....
SVC , they also have some nice fans...
As you only have a 2200+ CPU any of these Heatsinks will be overkill... I would simply look for the cheapest and get a good manually adjustable fan for it. My suggestion is one of these combos...
Heatsink
Budget ...
Higher End
Fans
1... ...
2... ...
3...