I do think a paper crimper is a good idea. I'd also recommend the Brilliance ink pads in gold, silver or copper (much better than the Encore inks that we can purchase through SU - and yes, I'm a demo!
) ACM carries several Stazon colors, which are great for watercoloring or non-paper projects. How about stocking up on adhesive (they have a wide variety to choose from), or even investing in a Xyron. You could also pick up some sort of rolling tote if you're an "away from home" stamper.
Have fun shopping!