Ugh, this debate drives me nuts.
Does the scale really matter all that much? The 1/48 line of VF-1 is AMAZING. If you have them, then keep them. They're good toys. So the YF-19, VF-0, SV-51, YF-21 and so on are in 1/60 scale. Is it really so important to have your VF-1s and VF-0s in the same scale?