SE Stout is a pretty cheap aluminum frame that is about as BMX as your gonna get with a 29er.
it was my backup bike and but has since become my main trail ride. nice handling aggressive frame.
i am 6'3" 225 and i ride the xl with 80 sh!tloads of seatpost showing and a 120mm stem.
- the revolution will not be motorized -
I would like to see what 80 ****loads of seatpost looks like.
The B.M. Flyer may be more what you want bumknee. Its a 29r, rigid, and has more of a "DJ" geo (not really, but more slope in the TT.) The Stout is more like a very beefy traditional old school geo. The Stout is SS only as well (horizontal drop outs) the BM has vertical and a D hanger. They do use gussets on the HT to the DT for more streanght. Both very fun to ride, bu the BM Flyer is I think more what your after. SE is a Fuji brand, so any Fuji shop should be able to get them for you to try.
I had no idea 29er DJ's even existed so I Googled the bikes the other people mentioned. The Stout is indeed 100% CroMo, but the SE Big Ripper looks like it has better geometry for jumping: http://www.sebikes.com/Flyer/29-BigRipper.aspx. Can't find anything called the B.M. Flyer though (does B.M. = Blk Mrkt? Don't see a 29er on their site).
For a pump track, it would be great.
However, Dirt jumping is not a good application for a 29er. The wheels are weaker for the same spoke count and the extra fork to crown distance puts more stress on the head tube, and fork for that matter. You can beef everything up to compensate (rim strength (Kris Holm), Fork, Head tube) but then you're adding weight.
For the record, I ride a 29er for XC use. You've just hit on one area where it really doesn't make a lot of sense and the 26er really is the "sweet spot".
i do some light jumping on my 29er, i already bent the back rim and im a couple pounds shy of 150. fwiw
 Specialized P3 -  Origin8 Scout 29er -  Specialized Epic Comp -  Specialized Allez -  - Specialized SX Trail II - (((In Pieces - '08 Jamis Parker -- '07 specialized Hardrock Sport -- 2005 KHS DJ200)))
okay, I looked that a Stout a the LBS, and it is alum, but the BM is a better grade.
I think it's a bad idea and I love my 29er.
Similar reason I wouldn't want 7 inches of travel for that sort of riding too. The 29ers just don't have the same sort of pop that smaller wheels do. The taller you are the less it matters, since a 29er on a really tall guy is kind of like a smaller guy on a 26er... to an extent.
no it really wasn't, and yes you did, lol.