Andrew, you have raised a number of important issues in your very first post. Let me attempt to address at least some of them.
Without meaning to be (too) flippant, the lever which is the most fun to use is the one that makes the best espresso. How you find out which machine that is, is another issue entirely.
I started getting "seriously into" cappuccino (first) and espresso (second) while at Uncle Charlie's Summer Camp. That was long ago and far away, back when Stevenson had the best espresso in town, Caffè Pergolesi was still on Pacific, and Lulu Carpenter's was a first-rate bar (that didn't know what coffee was, unless the word "Irish" preceded it). I bought a new Pavoni Europiccola for $299 at the Farmer's Exchange and a Krups blade grinder and -- I was set! Yeah, for about five years of major frustration . . . sometimes I'd choke the Europiccola; sometimes the espresso would be fine. But the most Royal PITA about the thing was the small boiler -- if any more than two people were having coffee (or if I forgot to fill the boiler), I was up the proverbial creek without a paddle. I finally got fed up and got a Gaggia Coffee and never looked back . . .
The point is that, even if your wife doesn't drink wine or coffee (you've checked her birth certificate? her passport? you're
sure she's Italian?), other people will be over at your house from time to time. Make sure whatever machine you eventually get can keep up.
Personally, since you are looking towards vintage/used machines, I'd take a serious look at anything that became available! They don't come up all that often. Were it me, I'd pass on the Europiccola unless it was a 16 (larger boiler!). Even then, however, I'd think twice about it -- they seem more temperamental than, say, an Olympia Cremina, a Ponte Vecchio Lusso, or a Sama/PV Export.
Don't forget to check out
Orphan Espresso, as they are a great source for old machines, parts,
and hand grinders. Check out the Italian eBay, too, as there are a couple of people there who often have older machines available, and they ship to the US.
Cheers,
Jason