I'm not entirely sure exactly what you are looking for, but whichever bike you get, your experience with it will educate you and you will have a much clearer idea that you want a bike that is lighter, stiffer, has higher gears, has lower gears, is red, etc. So you can't really make a mistake, or you can't avoid making a mistake, because the bike that is perfect for you now, will be lacking in something as you change.
In any case, welcome back to riding, and good luck.