Here's how I would rank them:
Foster (if he plays) - he tore up Indy last year, so if he's playing, you can't sit him
Forte - is a factor in both the running and passing game, and usually stars the season well
Jackson - still the focal point of that offense
Hightower - for now is the #1 back, but who knows would could happen
Tate - even if Foster is out, there is still Ward to worry about in that backfield
It's a tough decision between Jackson and Hightower, but Jackson has more potential to make an impact as a receiver. Hightower might be more likely to score a TD. I'd say go with your gut on this one.
If you get a chance, help me out:viewtopic.php?t=494727