I know there have been several suggestions for the organization of the store. I think another great idea would be to add a sorting feature which sorts by what you have tried/purchased and what you have not tried. There are so many REs now, and there will be so many more! Would be great to be able to place all untried REs at the top of the list.
And then, further in the future, it might be great to have a 'sort by similar products' or simply more categories for searching. After all, Reason has a rack for...so many different things