No need to decide now.
However, you may want to take a written inventory or what rulers and gadgets you already have ... to take with you so you don't buy what you already have. A friend gets lots of duplicates and triplicates because she doesn't know what she has. Which is fine by me as I get some of her extras free.
My best purchase was the Martelli mat. The expos are about the only place to buy them. Mine has outlasted many of the other mats I have had and it seems my blades keep sharper longer.
The Martelli rotary cutter and most other items are easily available at LQS's, Joann's and the 'net.
Otherwise what I would really want is some of that gorgeous batik fabric ... if I had the $$$ and space for it I'd buy lots of that. Unfortunately, not an option right now. Darn.
ali