Abba in Orleans
I have only been to Abba during summers, but the food is excellent. As I recall entrees range from $18 to $34, appetizers generally in $5 -14 range, very much in line with the quality of ingredients and preparation.
Dinner for two with perhaps two glasses of wine by the glass, appetizer, salad, entree and dessert usually runs $25 - 40 less than Nauset Beach Club in Orleans, as a point of comparison. We enjoy the Beach Club, but find Abba's food more consistently prepared and perhaps a bit better overall.
It is one of my favorite Cape restaurants, and I would think worth a drive if you can afford a dinner at that level and are attracted to the cuisine.