I'm about 6'4", 250lbs, and I'm looking for a board. I'm on a budget, too.
Do you think the MBS Atom 95x would work for me? http://www.dirtboarding.org/mbs-atom-95x/
Also, I have my MBS Reactor for sale, which is pretty beefy with the frame and all. I think I actually might end up keeping it because of how awesome and sturdy it is. One thing, though: is there any way to rig up a break kit to it? It has the 3-screw hubs(not sure what hubs the mbs break discs mount up to), and there are no screw holes in the trucks to mount up the breaks. Do you think I would be able to drill 2 the holes for the breaks and get the MBS break kit working? (I think all I need is to drill one hole on each side of the truck). With my height to weight ratio, I gain some nice momentum going down these hills around here and I'm still learning how to power-slide so I figured it would be cool to get some breaks on this beast...
Here's a pic of the wheel, if it helps...

Oh yea, one more thing, how do I change my avatar? The usual upload box isn't showing :P
Thanks for the tips,
maxx