I bought a Case DX29 about 2 1/2 years ago at A-plan pricing -- dealer cost. I had them add a grapple and the plumbing to go with it plus a set of rear hydraulic valves. My price new was less than your quote, but as noted, that cab is worth at least $3500-$4000 used and I would put the snowblower above $1000, although I wouldn't want one that badly when a blade will do. I have just over 200 hours on my tractor.
If you need a cab and will never need to have a short tractor to clear garage doors and such, that sounds like a good price. Spend one winter clearing a lot of snow on cold windy days and you will be very happy to have the cab on there. Spend one summer doing a lot mowing on hot sunny days and you will be very happy to have the cab. I live in the woods on the lee of a hill, so neither of the above applies and I'm pretty happy without the cab. Besides, I would have ripped it apart 20 or 30 times by now going into the barn, the garage, or under branches. It's bad enough when I forget to lower the ROPS!
! I do not know what part of the country where you live, but prices for tractors fluctuate widely in different regions. The NE appears to have the highest prices. The price seems a little high even by NE standards (but not much based on what I paid for mine new), but you are getting a lot of tractor with essentially "breakin" hours, cab, SS, HST, a solid FEL, and a 60" snowblower thrown in. I would not walk away from this opportunity just yet. The "29" is a very solid/tough tractor. Just keep in mind that with the 153 hours on it it has hopefully been 50 hour serviced and everything works. The more I think about it the better this deal sounds so I am closing. Please fill in your profile and tell us more about your location, property, terrain, anticipated projects, short and long term projects, and the membership of TBN will help you spend your hard earned money 
