Hi,
I know what you mean. I'm currently in a similar position and have found myself slipping into late night internet voids searching for the perfect purchases. However, I think I've got it clear in my head that its almost impossible to have everything in one bass (enjoyment, investment, resale etc.) It sounds like you've got a few nice basses there as workhorses, plus they should hold their value, so the Ricki would certainly be different and a great addition to any 'collection' but you simply won't know if you're going to like it until you pick it up and play it. Even then, you might decide that it's not a gigger but still has investment potential (which they do but not like an old Fender it would appear) and decide to keep it tucked away somewhere. I had to play one on a gig we did in Spain and I hated it, not because it wasn't a great bass but because it was so different from what I was used to and I had to fight all night to play a set I usually breeze through. The neck was thinner, the pup cover was exactly where I'd usually pick on my Jazz, the body balanced differently. Perhaps ask yourself what the Ricki is for.. Is it for THAT sound, or the look, or just cos you're bored with Fenders and fancy a change. If you're still really not sure, buy one second hand so at least you don't lose so much on depreciation. Failing that, go and check out the Italia Rimini. I use one and its pretty close to a Ricki without the price and is certainly a change from a Fender, even for just a few songs..
Happy hunting..