As Dave stated, the 650 is a very reliable bike. That said, some of the 02-04 models had an issue with the final drive. It's been known to fail on other years as well, but most failures occured on those 3 model years. I have heard a few instances where it happened a second time on the same bike, but quite rare.
It happened to me on my 04 at about 12,000 miles. I found a used unit and didn't have any more issues after that.
The clutch is on the weak side, and again like Dave said, the aftermarket spring has been a proven fix for this issue.
My advice? I'd say that since you already fixed the final drive, you should not see that issue again. (It's important to have the drive splines lubed!) The clutch is an easy remedy, and you should then have many miles of fun! Just my 2 cents. Do what you feel is right.
2007 Vstar 1300 Tourer
Too many bolt-on goodies to remember!
Gone but not forgotten...
Memeber of the Black Bike Club -- Fastest Color Available!!