New PSDs are dropping considerable in price - at least the 08s left on my local dealers lot.

I think a F250 4x4 SC PSD is around 31,000 with incentives.

Should I wait for the new 6.7s? AND wait a little longer until
all the bugs are worked out?

I do hope the 6.7 does actually have MPG gains over the 6.4.

Would you remove the DPF on the 6.7?

 

I would either buy a 6.4 or wait until the bugs are worked out of the new 6.7 and its emissions system.

I don't think I would remove the DPF on a 6.7 unless I also removed the SCR and the urea injections from the programming. Another reason to wait and see how this whole 2010 emissions change shakes out.
This 2010 thing is big, potentially more issues and unknowns than the 2007 change.