I have that problem, I love the sound of almost any bass, particularly Birdsongs - especially the one I ordered (and that too, was a hard choice). After careful consideration, the only reasonable solution I have is more Birdsongs.
BTW: I grossly overestimated my abilities to wait. It has only been a month since placing my order and I'm leaving claw marks on the walls...the neighbors are disturbed by my shrieks. When salesmen call, instead of just playing my bass for them, I now carefully explain my plight and ask how they would manage it.
Yeah I'm not sure what to do about my build. Slap has always been a bit of a fantasy, but I don't know if I would use it a ton if at all. I do like the idea of the two soapbars being more of a J bass to my CBass though.
The Delano is real nice too, and either one would give me that nice modern, more high fidelity tone to counter the warmth of the CBass.
These are very difficult decisions!