Vandersteen Upgrade Path

I currently have the Vandy 2ci, the 2wq and the Vandersteen center channel for HT (not sure I really need it though since I usually sit right in the middle). Anyway I am thinking of upgrading and was wondering if it would make sense to add a second sub or get the 2ce signatures and continute to make to do with one sub (at least for now)Upgrading to the 3A sigs would be too big a stretch on my budget (unless I sold off the 2wq and center channel that is). Any thoughts?