I always consider stamps to be a good investment. This is especially true if you select ones that you can see yourself using time and time again. Here are a couple of stamp sets on my wish list from Avery Elle.
This set on the left is called Bright days. I think it would be perfect for creating some graphic bursts on my layouts.
I can envision myself creating some wonderful custom backgrounds with the Fanfare Clear Photopolymer set. I am envisions waves and beach layouts.
The Ikat Clear photopolymer stamp set has a really cool feel. Kind of like chevrons meets wood veneer in a funky sort of way.