Gotchya. I'm not looking for something street legal so that I can long range ride. I want it street legal so I can ride short distances (like getting some food thats by the trails). So I'm not too worried about how well it actually does on the street.I don't think you would be overbiked with the 450 from what I know of sw riding. Keeping in mind you will be riding with your wife on a smaller rig the 250 on the other hand may not seem too small. If I was going to turn it dual sport the 450 would definitely be more palatable to me, but again I feel it would just be trying to make the proverbial silk purse. If you want to ride on the street get something you can enjoy there too. It safer and more comfortable too.
Anyways, it looks like the 250f will probably be the better choice for me, but I think I will be open to a 450f if I find a nice one before coming up on a 250f.