If you like Thai, I can recommend a little place called Red Snapper on Dyke Road (just south of the Seven Dials). My misses and I discovered it a couple of weeks ago. The food is great and the BYO alcohol policy makes it no more than about 15 quid a head!
Jade.Western Road.All you can eat for £13.95.Or be truly romantic and go Monday Tues,Weds or Thursday when it's er,less expensive.And it has the added joy of being Chinese so you get a couple of days off afterwards as well.