consider making your own vitamin c/ phenidone/ propylene glycol developer. easy to make. cheap and is quite similar to xtol.
That's PC-Glycol, or if you replace the glycol with triethanolamine it's PC-TEA. It's where I ended up with much the same criteria as the OP---I liked the convenience of a liquid developer, but wasn't entirely thrilled with HC-110, and I like the hack value of mixing my own chemistry. (It's nice not to have to worry about my developer being discontinued, too.) The developing agents are the same, and in much the same proportions, as Xtol.
I ended up switching from HC-110 to PC-TEA as an everyday developer, but I have to agree with some other posters that the difference isn't night and day. PC-TEA, with little or no solvent action, seems to be a little sharper, and I've convinced myself that there's a Certain Something about ascorbic acid as a developing agent that confers a different Look---but that's such a subjective judgement that I'm not confident it's based on anything concrete at all.
-NT