I'd ship it. Tell them to leave it in the crate and ship it to your local dealer. It's cheaper. Your gonna pay for setup anyways.
I'd like to think I would ride 1200miles, but in reality I know I wouldn't like it.
The main thing is be truthful in what kinda rider you are. Are you REALLY a long distance rider. 1200miles on a stock seat IS a long way, even in a car. Plus, on a bike your not used to. It would suck to be halfway home and realize it was a BIG mistake. Then possibly end up with you regretting your purchase. I wanted to give you some realistic advice, rather than the "Just do it" comments you get.
If you do ride it back, GET A GEL SEAT.
I have a stock seat and fortunately I like it just fine.. I take 600+ mile daily rides when I get a few days off and have never had a problem with the seat. I did do the Buell Peg Mod and really like that, but that is all I've done to it besides cosmetic stuff. He said he takes long rides on a regular basis so I don't know why this would be an issue, and if it is, just ride fewer miles and take an extra day.. JMO..