What type of workout shoe should I buy?

Anonymous
I am desperately in need of new workout shoes. My old ones are far too old (6 years). I've gotten serious about my fitness now over the past couple of months, and I need a serious shoe to go along with my outdoor workouts because the worn out shoes are killing me and I keep putting off the search for new ones. I'm going to hopefully be starting a 'couch to 5k' program soon so I'm thinking maybe a running shoe, but due to previous injury to my knees, it will depend on how I feel. Regardless of whether I stay with the running program or not, right now, I walk and walk a lot, some 3-8 miles every other day. The trails I use are all smooth concrete. My thing is, I can only really afford to get one pair of shoes right now, so if I go with a running shoe and I can't complete the running program, is there really a big difference between running and walking shoes or should I get a cross training shoe, or can I run with a walking shoe? My budget is $75 or less.

If you have a particular shoe that you think would work for me, please list it and/or post a pic. That would be a big help.
What type of workout shoe should I buy?
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