I started out with Quilt Wizard and have really enjoyed using it. Recently treated myself to EQ7 and have not really learned how to use it to anywhere near it's full potential yet.
But I would definitely recommend trying Quilt Wizard first if you aren't sure whether you would use a quilt design program. It was sufficient for me for the first couple years I had it, but I discovered I wanted the extra features enough to go on and spend the money.