the CD700 has an awesome reputation for superb SQ, so i would expect to be significantly better than the pioneer 9450.
neilo: you lookin' at nak HUs (and sub) but in the other thread are thinking about pioneer coaxials and 6x9s??? what the? :shock:
if you will only run pioneer coax speakers, then you are grossly overcapitalising on the HU IMO. of course if you like the name, cosmetics, etc, then sweet, but you will get equally good SQ from a HU costing no more than $4~500.
nak HUs perform best driving audiphile speakers and amps. or at least have the potential to shine when doing so.
if you're on a tight budget then i'd suggest at least doubling the budget for speakers and halving that for your HU. you'll have far better results.