Upgd nt4 pdc to w2kad

I need to upgrade a nt4 pdc to w2k with AD. My plan is to build a new nt4 box, make it a BDC, promote it to a pdc. Take the old nt4 pdc off of the network, then upgrade the new pdc to a w2k AD/DController. So far does this plan sound correct. Weare running a Linux box as DNS. Are there any pitfalls I should watch for. Or am I opening a can of worms. The PDC is having major hardware problems so it HAS to be done. Would it be best to just leave the new machine as an NT4 PDC considering the Linux DNS?