Hmm. I'd say it depends on how much you really need or use that SCSI port. I've got my Pismo that every now and then I've wished it had SCSI for hooking to old drives and what not. If you use it or even forsee using it, keep the Lombard. You're going to like the 12" G4 a whole lot more than the Pismo for just everyday activities (at least, I did while I had one), so if you've got a really great OS 9 machine, keep it like it is.

People do seem to be selling Pismos like crazy, for decent prices. You'll have your OS X and everyday computing covered by the G4, and a very decent classic G3 to cover your classic stuff. And the legacy ports on the Lombard might come in handy, you never know...But if you don't use those legacy ports, the Pismo has the advantage of being a little faster, having more memory, being more connected to your other systems via internet, and being able to do all the features OS 9 has to offer.

If I was in your shoes, I'd keep the Lombard. I'm a very retro person, but I like having something newer and faster as well. The Lombard and the 12" would be a good combo to have.

So that's my two cents.