Here's my $0.02:
I bought a rear mount blower 2 seasons ago for the following reasons:
- Cheap:  Found a used Farm King 50" blower for about $700.  Just about the right width for my 2320, which is just under 48" wide.  New they listed around $1500 or so if I remember right.  I had priced a front blower from Deere.  By the time you get the front hitch, front PTO kit, and the blower, it was well over $3000.
- Leaves the FEL on:  Usually I don't get out to clear the driveway until after work, after the plows have pushed a large pile across the end of the driveway.  Often, that pile is packed hard, had salt in it and turns to about 1/3 ice by the time I get there.  Blowers don't do a very good job of cutting through that stuff.  With the rear blower, I can blow out to the road, turn around and dig out the end drift/pile, then carry on with the blowing.  I can also use the FEL to scrape concrete, back drag snow from up against garage doors, etc...  Basically gives me a mult-tool for snow removal.
If you don't often need to use your FEL while removing snow, then the front mount is definitely a winner from a comfort standpoint, but all the factors need to be considered for your situation...