How are you planning on venting it? Does the new place have a suitable, doable location that is somewhat centrally located? You can't use the propane furnace chimney, it needs it own. Is there an electrical outlet close by?
The larger the pellet hopper is, the better off you'll be.
I'd be leery of a used one, unless I could see it working, or know and trust the seller. If used, then what about the availability of parts, if needed? They flooded the market with a lot of models that aren't around anymore, parts are hard to find and very expensive to buy. (To make you feel better, my stove is over 8 years old and I haven't had any problems with it, just clean it on schedule and it's good)
There's a big difference in the quality of pellets, I've never used softwood pellets, always hardwood, low ash. Don't stock up on pellets until you're pretty darned sure you're buying good ones.
Some pellet stoves generate a lot more noise than others.
I'd assume you have a convenient place to store your pellets?
At those prices, the pellets are about 1/2 the cost of LP.