Hi,
I'd go with steel rather than a cheapo aluminum frame. Alu doesn't have to have a harsh ride, but a lot of cheap ones do.
Surly also makes a bike called the Pacer. You might want to take a
look at that one as well ( http://www.surlybikes.com/pacer.html )

But I am starting to wonder where you see this project going. You are looking at a steel riser bar? Let's start at the beginning here.
What sort of budget? Do you plan on other activities like touring?
Are you going to cannibalise your current ride for parts?