Next time you can try Carton Lucas. An even finer meal (though you did well). You might have liked a heavier white wine with that meal, something like Corton-Charlemagne. As for the Zagat rating, it is against peer set, so 26/30 in Houston means it is better than a lower rated restaurant in Houston, but gives no hint where it would be rated in Paris ... it could be 30/30 or 1/30, in their rating system. The other extreme are the Michelin stars, which are pretty uniform world-wide (leading to much controversy as it is impossible for some cities to ever become 3 star as they just don't have access to the right resources).
If it makes you feel better, I remember spending USD1000 for dinner in Paris 20 years ago (a fine meal, but by no means close to the upper limit of what it could have cost). I still recall fondly the "fraises des bois" served at the end of that meal. Money well spent, in retrospect.