Modifying an existing bike can be cost effective, and I am currently working on my Specialized AWOL to make it more back-friendly.
I was looking for stems that get your handlebars up high and found Ergotec Stems. I personally have a High Charisma on order:
Products - Ergotec
Velo Orange have a similar stem in stock now, and their stocks of Cigne stems will be replenished this Spring sometime, according to an email from a company representative.
Threadless Stems - Stems - Components
Velo Orange also have several handlebars that help in reducing drop/reach and giving you a more upright posture that you can easily navigate to from that link.