I've done about 10k miles in as many months in my 650, most of it touring with several 350 mile days. It is, without a doubt, the finest touring bike I've ridden. I probably don't have quite the breadth of experience with different bikes as others here, but I've owned a couple of Honda sport touring bikes like the ST1100, and would much rather ride the burgman.
Comfort is the biggest factor for me. The feet forward, laid back position of the scoot just begs for long days in the saddle. Throw in the storage, protection and auto tranny plus ample power and the 650 wins hands down. It's not a Goldwing, but then again a GW isn't a burgman either; there are advantages to both. Let's just say, you won't be disappointed.
So far as new or older model, there are again, advantages to both. Personally, I think you get the best deal with used bikes. I got my 05 for $3300 usd. If I get 50k+ miles before the cvt belt goes Davy Jones locker, I will call it a day and look for another bike, well satisfied I got good deal.
Add a rider backrest, Airhawk seat pad, some storage boxes, gps, throttle lock and call it a day for add ons. You won't need much else except some music, fuel and a destination.
Except for the usual suspects, these bikes are almost maintenance free. Good luck on your search and decision.
And welcome to BUSA from sunny Los Angeles.