The finance wouldn't be a problem. It'd all be done over the phone and just sign on the dotted line when you get there. You could be in and out in an hour. (I clean car showrooms and chat to the girls in there, who've said as much)
As for warranty. A lot of places use a nationwide warranty company. It may be the case that a garage near you is in the scheme and you could be covered...
Not trying to push you bud just hope you get the best deal you can, not just the nearest...