If it is a question of "when" you get the bigger Vandy's as opposed to "if" you get.... then pick the 4B-SST. If the price between the 3B-SST and 4B-SST is significant to you then consider a late edition 4B-ST instead. If you are uncertain about stepping up to a larger Vandersteen then you will still find the 3B-SST (or 3B-ST for that matter) delightful. If you KNOW you want something most expensive then save a little more and get it now. Fewer upgrades CAN be a good thing financially over the long run.