Share 'Tubulars Vs Powertap'

I have a Dilema and need some ideas.  I have put and order in for a Powertap.  It has been on backorder since February 2010.  I understand the benefit of training with this piece of equipment, but my question is... Would I be better off sticking with the Powertap and wait for it or should I build up a tubular set and race on tubulars this season?