I've had Sopes at Hacienda de Vega as appetizer but as my entree and they were quite good.
Vanessa's Mex food in Escondido has Sopes and one of our fave Mex is Los Charros on E. Valley Pkwy has excellent food but don't recall Sopes but all my friends swear that the carne asada burrito is one of the best in town.
Bety's in Encinitas has some good ones.
I recently visited Hacienda de Vega for the first time and they have a Sope appetizer.
Didn't try it but the what we did have was good although kind of pricey.
I have had Sopes at Fidel with varying results.
My last experience at Fidel's was horrendous and won't be returning ever.
I have to say I really like Sopes though.