D70 - excellent tool!
I have a D200 and a D70s.
I use the D200 for weddings and higher end work but the D70 is used all the time for event imaging - parties and the like.
I am cyurrently shooting upwards of 500 shots a night at "A night in Bancock" in Milton Keynes.
It is much lighter than the D200 so when you have on your neck for 6 hours at a time it is more bearable. Battery life is phenomenal one battery lasts all nght which would not be the case with the D200.
6mp is fine for most work including weddings so dont be swayed by the "need" for more pixels.
As many are swayed ,you will find loads of little used D70s's on eBay so go for it. I hope you dont get one of mine that has done 800 shots a night for 3 weeks though!