Thanks for the input, guys. Bob, unfortunately, I don't have the option of auditioning the Jolida at all. There are no Jolida dealers within driving distance. (I'd be willing to schlep out quite a bit, but I can't even find any within a five hours' drive!) I've heard good things about Jolida, and I was kind of obsessed with the idea of getting a 102b until I discovered just how inefficient my Advents are. The one good thing about them is that they are not at all lacking in the bass department, so I doubt I'll be wanting a sub anytime soon. To quote Stereophile's retro-review of them from a few years back: "there is useful output down to 30Hz or so."
Despite the fact that there is no local dealer, however, an inquiry to Jolida regarding the suitability of their products with my speakers resulted in my getting a personal email from the president of the company, so I feel like I would have a good support network with them if I chose to go that route.
Here's another thing to ponder: the Smaller Advents are far from being a flat, neutral speaker. They have a very wide frequency response, and good dynamic range, but they're definitely not modern, "in-your-face" speakers. Would the combination of SAs with Jolida be too colored or muddy? Or would it not be an issue? Or could it even sound cool and retro?