For anyone looking to start fresh for 1.7 with a new map, you should check out Amidst. I've been using it to find a seed that I like for our server. It uses version files to generate maps based on either a random seed or one you put in.
Here is the official minecraft forum page so you can check it out yourself:
Yeah. It's an amazingly handy program. I've gotten a lot of use out of it.