Very very good, well balanced

Waw I made it with prosecco and this was a treat :-)
I made it soon after again with another prosecco but it didn't blow me off my socks. Although the prosecco wasn't cheap, the taste wasn't great at all and spoiled the cocktail.

Does anyone have any suggestions for sparkling wines? Even better if the brand has small bottles because I'm not a professional :-)

In my opinion, Prosecco tends to be too much fruity (it reminds me of pear).
If don't wan't to use champagne, you might use french Cremant wich is usually much dryer than Prosecco.
Might be hard to find depending where you are living but It's widely available here in France and quite cheap.