I hate to be controversial
...
Spend £1,500 on a PCX with 1,000 miles from new. Don't bother servicing it regularly, just run it into the ground.
I've done 12,000 miles and spent £60 on a service at 8,000 miles. That's it, and it continues to get me around the world. A GS would have broke down by now.
There's a Swedish guy in Iran right now on a R1200GS. He's completely screwed with a knackered final drive and has been quoted four weeks to get the part sent over.
Small bikes = bigger brain.