The KDX is a good choice. Be sure and use the search function and you will find tons of info. Be sure the read up on maintenance tips, as well as, hop-ups that you can do for free or just a few dollars. Enjoy riding and ride with a buddy. Watch the Local Chapters forums for semi-organized rides near you. You'll find new places to ride and new folks to ride with here at DRN and we all love to ride, race, and bench race.
Be sure and read the FAQ's. Have fun and Welcome to DRN. BTW, DW04 is only a month away, Cooperland Raceway, Stillwater, OK.