I went in to the dealer absolutely convinced I wanted a TC33D for my 5 acres. I came out with a TC18, because the dealer listened to me and what I intended to do, and talked me out of the 33. However, my uses are somewhat different than yours -- I don't mow, and my FEL and/or box blade are in constant use. The convincer for me was that the 12LA loader on my machine has almost the same capactiy as the 7308 loader that used to come on the TC33. Now that the 14LA is available for the new TC33's, I might have made a different decision. I don't have a finish mower or a backhoe; I'm on of the odd ones on this board who doesn't think that a backhoe on a compact tractor is worth the trouble.
Bottom line, I don't think the 33 is too much for your property.