I have all three as well, mainly because the basic model of the P/J I have only came in that configuration.
I wasn't initially a big fan of P/J's just because I felt they gave you a decent
piece of what a full P or J could give you, but not the true sound. Solo'd P pickup debatable and dependent on the instrument, itself.
I always struggled to get a good blended pickup sound as well - Solo'd P or J pups would sound as I expected them to, but blended, it was a lot more difficult for me to get a sound I liked.
That said, I love my P/J now that I've bonded with it a bit. Gigged with it for a few months before the cover band I was in stopped playing out. They sound good in a mix, but when played solo, they don't do too much for me. If I were in your situation, I'd be plenty happy keeping my individual P and J, and put the cash for a P/J towards something else.
That is unless you've got your eye on a new P/J already. In which case I'd say ignore all the text above this sentence and get it
