Hey Brat, first off...you are going to love the Sprint. I also used to have a shadow (another great bike). I believe the difference was in 2002 when they went from shim under bucket to shim over bucket...or something along those lines. Mine is a 2001 in BRG. I added a staintune pipe and got it working right with a tuneboy and it has given me many miles of trouble free riding. I also went down one sprocket on the front to give i t a little more pep in the twistes.
I did my own valve adjustment without any hassles and didn't have to remove the cams thanks to the
handy little tool that I had my friend make for me.
My bike has almost 40k on it and I have never had an issue with it. I had to adjust one valve that was slightly out of spec at 24k, but that's all I have had to do besides the usual oil change.
I also have the genmar risers on mine and think that they are a worthwhile modification. I would also suggest a different seat. I have the corbin on mine and it is comfy for many miles...the original seat was just too soft for my liking and I was in lots of pain after an all day ride.
Good luck with the purchase.