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.
225-275'
cheetah, gazelle, leopard, xl, polaris ls, raven, sabre, bomb
275-325'
cyclone, eagle, teebird, valkyrie, xs, jls
325'+
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.