Hey keurosix, I actually considered selling my Ibanez 6-string, but I'm hanging on to it for now, just in case I need a low B! I don't feel like I need the extra range that an F string would provide - I am just loving the SC 5-string so much! The baritone part of the doubleneck goes up into that range, in case I ever need it.
As for the symmetry, I was basically playing the 6 like a 5 and ignoring the low B, so the SC feels perfectly natural. But that's just me!