Just saw this later post... My point exactly. Why do you feel the need to sit bent over (i.e. in a more aggressive position) just because you're on a road bike. It's perfectly fine to sit up straighter on a road bike too.
There is nothing wrong is sitting up straighter on a road bike at all. They makes road bikes like this for people like you and they're in the endurance geometry category.
With the use of spacers and a positive rise stem you can have a very comfortable position on the bike.
When you get your new bike tell the person at the bike shop the following - use more spacers and make the stem rise up to make the bike more comfortable because I'm not flexible.