First things first, there is no industry standard for contrast ratio.
one manufacture's 3000:1 may be another's 1000:1
2nd, Dynamic contrast ratio is pretty much a trick... like factory OC'ed gfx cards
they take 2 monitors, one with underpowered back light lamp. one with fully powered, regular lamp,
and they measure the black on the underpowered one, and measure white on the regular one. there is your "dynamic contrast ratio"
why do they do that? that makes the numbers look larger. making them look better to the general public.
are you really going to under power your monitor during regular use? do you even know how?
I suggest looking at static contrast ratio... then again refer to "no industry standard..."
best way to compare monitor is to find respectable reviews... or go to your local electronic store yourself and compare in person