DR200 1st mod
The best thing I've done to my 2003 DR200 that I got last year ($1500, 728 miles, but scratched & dented tank) is a 16T countershaft sprocket. It's so much more versatile on pavement, so unless you're planning to do some hill climbing-or stump pulling-that would be the first change to make. Usually on eBay for about $20. Just my $.02.
Larry aka CharlieDog