kubotafan-- yep, methinks yer right. I just did some numbers, too; I had been surprised at the drop in payment amount, but knew I'd have to crunch some numbers to really make a decision.
Yesterday I took my little beastie down the road (to Thomas' old house) to clean up the parking area for a friend. Son's away at college, others in household are really not able to shovel indefinitely.... There was a lot of built-up packed snow/ice, as well as a lot of space that had never been cleared. Their parking area, which could easily hold five cars side-by-side, had been reduced to barely enough room to park two and get out to walk to the door.
So I drove the 2310 the two miles down the road, chewed on the ice & packed snow with the blower holding the front wheels off the ground, knocked some log butt ends free from being frozen to the pavemant & removed them, etc. etc.
That little 2310 did just fine on a relatively tough job and I was really proud of its ability to get through all that stuff. (Only had to change BOTH auger shearpins once!

)
Rick at Northwood had said, of the 2300 that was being replaced by the 2600 the day I was there, the the owner said he hated to part with the 2300-- it was like a member of the family!
Yeah, guess I'm there, too. I'm gonna keep the 2310. Looking at numbers, I came up with just about the same as kubotafan- just under 10 grand for 3 year's use.... Too much for too little, and the 2310's just fine the way she is.
Thanks for all the advice/comments concerning the decision, TBN!