I reached Rank 19 tonight, it's great that just about any form of connection beyond wi-fi trading will bring in people to your Avenue
Right now I've 2 Rank 7 Antique Shops, a Rank 7 Raffle, Rank 8 Salon, Rank 9 Berry (B2 type) shop, Rank 3 Deli, Rank 2 Nursery, and a Rank 7 Dojo.
The Antiques are a bit hit or miss but they're cheap so I don't care that much.
The Salon is a godsend for happiness evolutions, Combined with the Deli friendship meals & I'm guaranteed at least one a day with minimal grinding.
Beyond the happiness drinks I really don't care for the Deli. Unlike rare candies the leveling up options are just very expensive versions of the daycare; at least let Pokemon evolve from them.
The Berry shop, despite the ranking, goes mostly unused. I'll buy a batch to have them on hand but usually I can deal just fine from Dream World or the berry-based Funfests.
I have not used the Dojo at all, but I'm keeping it around for when I go for the Type challenge medals.
Nursery I'll probably keep around for when I start hatching a million things for the National Dex.
Raffle's just a nice shop to have around in general. Free lottery chance, why not?
I'm probably going to start cycling the Deli out once I wrap up the happiness evolutions so I can go for the 50 shops opened medal