well,i'm probably never getting rid of my blaster since it already has been modded the way i want it,plus i like the two stroke power, and i'm getting to poor to afford anything else, i don't have a problem keeping up with the big 450s. there is almost no limit for a blaster.
if u put suspension,A-arms,Axle. in a blaster it will jump like any other quad, my blaster has the stock shocks in it........ :-D i have no problem jumping on the racetrack but i have my own mx track in my backyard so i have practice time.
its your call, the yfzs cost almost 6-7 grand a blaster cost 2-3 grand from personal experience it seems like the 4 stroke aftermarket parts cost more.