Well congrats ongetting the new place first..
This time of year many mower dealers can offer great deals to make room for the 2015 models coming.. (FYI) That's how I got my 2014 Toro SS 4260 w/Kawasaki engine. (which imo is a very well designed machine & [U]NOT[/U] owned by MTD).
I personally don't like dealing with the big box stores, since they won't ever be able to fix anything should the need arise.. But that's me..
Not trying to sell you on a brand, you need to look at as many as you can, & test drive as many as possible. Then when you see something you really like, do some internet searching to see how others feel about that model..
Bear in mind when going to a V-twin engine, your gas comsumption is not gonna be anything like what you have now. But your mow times wil be greatly reduced, that's for sure.