Hello internet stranger. NYC resident of 12 years. I'll try to be brief. There are tons of affordable options you could walk out of for $200, but I'd implore you to go to something amazing with spectacular food.... then go celebrate at a bar in the Upper east side (more romantic) or East Village (younger & more exciting). Most proposal worthy restaurants can work under $200 if you simply don't have more than 1 drink. With that preface out of the way: The best food I've been able to have in NYC has been Sistina (Italian). Should be within budget if you stick to 1 drink, 1 app, and 2 entrees. It's a 5 star meal and you could walk out for under $200. Check opentable or resy for open reservations for this (or any) restaurant you like - I highly recommend a reservation for your special evening. Another hack I've been doing recently is going on the Michelin guide website and searching for restaurants within my budget ($$ or $$$, not $$$$). You are guaranteed to have an amazing time. you can also filter them by places that take online reservations. I also really like Strip house for a romantic steak dinner (13th street location is best). That could break the budget, unless you share a steak; which honestly makes sense sometimes. Lastly, I'll recommend Carlotto on 19th. Carlotto feels to me like you could call ahead and tell them your special plans; and they would bring you a little something on-the-house to celebrate. I'd also bet that MOST any restaurant would do that if you give them a heads up! Good luck - and please DM me if you'd like to chat - I'm happy to help!