Hi,
What to do I cannot tell you since I don't know the DGT 3000. I can tell you however that I've been quite satisfied with my DGT 2010, which I bought from new some 3 years ago. It has all the functions needed for blitz and rapid games.
Wishing you all the best with your choice.
DGT 2010 or DGT 3000
BUT BUT BUT
Their's a twist. I have an option to buy DGT 3000 , which is second hand, no box or instructions, yet guy reckons it's almost new, because it was just standing without use he said you can check when I bring it, but I don't know maybe there's some hidden fault which I will discover later ? He gives the clock and a box with it, which is for DGT XL clock , like what? Where did that clock go then? Any way there's a risk buying this clock as I don't know what exactly is wrong with it , maybe nothing, maybe something. Price he's was selling it $50.73 after a little bargain he said $33.82 and that's it!
Now second option brand new clock DGT 2010 which cost $ 74.21 brand new.
So I don't know what I should do , my main reason is clear screen and large numbers and durability. For blitz rapid games.