I agree with other posters about the box blade. I think the Frontier brand is what JD offers. When I bought my 2305 in 2006, I got the 200CX FEL, 47" front mount snowblower, 62" MMM, and Woods 48" boxblade. I have added a couple of implements since (brush hog and subsoiler). I always use the box blade when using the FEL. Provides counterweight, and as other posters have said, breaks up the ground for the FEL. Once you learn how to use it, the box blade is very useful and versatile.
Lots of good advice here, for me, the 2305 was the right choice. I use it for similar purposes as you describe. Going larger becomes a problem with mowing. The only criticism I have, as mentioned, is the ground clearance. The transmission cooling fan and oil filter are vulnerable. After putting a stick through the fan, I fastened some sheet metal to the underside to protect it. I build/maintain trails, brush hog, haul logs, and snowblow 80' driveway with my 2305, but probably most of the hours are mowing. Based on your property size, I could see you ending up with more tractor than you need to mow your lawn.