I know what you're going through. I'm less new than you at this, have 3 nice vintage bikes, and still look regularly. I'm fortunate in two ways. One, my first vintage bike was a faded but beautiful Tommasini. Having a high-quality Italian bike with a ride I love makes it easier for me to shrug off potential lesser bikes that I'd otherwise probably pursue. I went on to get two very good bikes at bargain prices (Univega and Panasonic) that are each at the level immediately below the full professional models from those brands. So any N+1 for me needs to be something special.

The other thing that helps my obsession is that I live in a state with scant vintage bicycling culture. The local CL for New Orleans and Shreveport are beyond pathetic (the Univega and Panasonic were opportunistically bought on trips to other cities, the Tommasini was a staggering fluke).

My suggestion is find something pretty special, something that you need to wrench on a bit to really make it feel like your baby, something that has looks that kind of take your breath away when you admire it hanging on the rack in your living room, something that feels like it was made for you when you're on the road. It won't stop the fever, but it will help you avoid spending a lot of energy on cool lower-level bikes that will soon clog up your apartment.

And yeah, Italian eBay has a LOT of very sexy bikes. I hesitate to mention that there's a poster here who's established a relationship with at least one Italian seller, and has been happily buying from across the pond.