KOKO I know you must roll your eyes at how I bang on about the Hairy Dieters but I honestly don't think I could've lost this much weight without them. (Other factors obviously).
I probably cook out of a HD book at least 5 nights a week. That means I know I'll be having a really good, tasty, decent sized dinner that works within a 1200 calorie a day regime.
Their dinners, with a small amount of carb added, usually work out at 500 calories. So I allow myself around 250 for breakfast and 260 for lunch giving me 200 calories for wine to play with. If you can stick to that for as long as possible, then you'll succeed, I'm convinced of it.
As a bonus, some of their recipes are now family favourites and the kids ask for them for dinner. I honestly think I'll carry on cooking some of them forever.
As a parting shot, the HDs have an online diet club. I've not used it so I don't know what it's like but if it's as good as their food, I'd be tempted to try it.