If ya feel the need and have the money this Adv Rider thread has some interesting suspension for a DR650 as part of a fairly major rebuild.

43mm WP forks and KTM triple clamp and steering stem; and a Wilbur's shock.

Here is another post where 43mm forks, tripleclamps, wheel and caliper from a 2001 250 SX have been used.

Guess you gotta be pretty keen cause they will still probably need setting up for your weight but if you are keen.........

Cheers R