It's been a long time since I used one and I know they must've improved since 1998. Will there be more than 1 kid? I had a triple jog stroller when I had 2 kids and used the middle for the snack pack so the kids could grab their own snack. Then when #3 came along, they all fit and when #4 came along, the oldest rode her bike next to me.
Here's what I would look for:
a well balanced stroller. It was easy for that thing to tip back, banging their little heads on the concrete.
A strap for straight aways when you need/want to pump both arms.
sturdy grip. Mine had worn away with use.
removable sun shield. Sometimes the wind resistance was too much with it on.
Fold ability. We used that thing at the zoo, as well as out our front door. It had to fit in the truck.
Resale value. We got half what we paid and that thing was very well used for 7 years.
Have fun! My runs with the kids were an important part of being a healthy mommy.