i guess next question... champion/pro line beast or dx?
imo, w/ 250' power, the beast is probably too fast of a disc to get max D with. i throw about 350' and i consider them too fast for me... but a lot of that is my throwing style.
generally, i separate drivers into groups that i recommend as minimum power levels.
cheetah, gazelle, leopard, xl, polaris ls, raven, sabre, bomb
cyclone, eagle, teebird, valkyrie, xs, jls
wildcat, beast, viking, orc, illusion, talon, flash, predator, crush, spirit, reaper, x2
the two components of consideration are stability and speed. i would just be wary over discs that are overly fast or overstable... as they can lead to tendencies you may end up spending a lot of time having to repair in the long run.
the actual d difference will likely be around 10% between each group.