Arrrrgh! The ongoing angst, eh? I started with far too cluttered, settled on the top of my recycling box (sun bleached boards) and have now moved to a mix of that and whitewashed boards.
One thing I've noticed since the move to a whiter background, is that my stuff now often gets chosen for bright and sunny treasuries. That didn't happen much with the grey-ish board background, which was cool, since my shop is DarkRide, not Sunny&BrightRide, but did limit my exposure.
You've beautiful items and I like your white backgrounds, but I think they need a touch of brightening. I use a free photo editing suite, Picasa, and it has a background brightening tool.