iv got 2 pioneer cdj 800 mk2 decks, and im about to come into some money, is it worth me upgrading to the 1000's or am i best sticking with what iv got and save the cash for something else??

Are you happy with the 800MK2s?

Is there any feature on the 1000MK3 you feel you'd benefit from in the upgrade?

Go with what best works for you. I swear by the 1000 MK2s I have, but now want to use 400s (if they get waveform, it's a done deal) instead.

It's all in use and feel and confidence of gear that should drive your take on it. I never will be one to say more expensive is better; instead I believe that better is better in whatever it is...