Ed - I loved Goa. Went there a few years ago with my bessie mate & had a hilarious time.
Ultimate romantic cheap holiday location is Thailand. Forget Koh Samui, Phi Phi and all those places too touristy and over priced these days- Have a few days in BKK -Jim Thompson's house (awesome), Wat Po, Chutuchuck market at the weekend, floating market, river kwai & then go East right by the Cambodian boarder in the Koh Chang Marine park and relax on lonely beach, eat seafood BBQ and chill out on the cushions listening to the ocean and bizarrely baleric chillout.