I haven't shipped a bike, but having shipped camera equipment and all kinds of other stuff:
Personally I would fork over whatever the extra cost (and I know it is substantial) to ship express rather than ground. Generally express shipments get much gentler treatment.
Also, I would not trust UPS with anything important. Insurance is fine, but it only covers the value of the bike, and if you wind up not being able to ride because they wrecked your bike, you're out your vacation (consequential damages aren't covered). I can't tell you how many parcels I've received via UPS where at least the packaging was totally destroyed.
Speed comes from what you put behind you. - Judi Ketteler