i personally say go with the d8. i have/had both the losi 1.0 and 2.0. personally they are not forgiving Rigs. they are very fast, but miss a beat and your all squirly and everywhere. for a well season driver this makes it fast and agile, for us club racers/partial sponsored drivers that means less consistent lap times.
the d8 in the other hands is a little bit slower, but much more forgiving then the losi.
also the hb has some new parts coming out this month for the d8 which are suppose to be much lighter. i have most of the parts besides the chassis.
it really makes a difference.
good luck!