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One of my favorite low calorie dinners is a serving of pasta (depending on brand between 200 - 250 calories) with a whole box of one of the frozen lightly sauced veggie mixes. My favorite is bird's eye and it has red peppers, broccoli, and carrots in a garlic butter sauce. I make the pasta and microwave the veggies. I put the pasta in a big bowl and then dump the veggies on top and mix. Sometimes I add a little extra buttery spread (I use Brummel & Brown which is 45 calories a tbsp). All in all with the entire box of veggies (2 servings is usually in each box), the portion of pasta and a little extra butter it comes out around 450 calories. Very big & satisfying!
I can't help but echo theox's concerns too. I just want to caution you about trying to start out too low. It's easy to try and go as low as possible because you want to lose fast, but it can be harmful to your metabolism. I eat around 1800 calories a day and I still lose between 1 lb to 1 1/2 lbs a week easily