I like the upside of Foster. He is a lot cheaper than Tate and Slaton and has just as good of a shot at winning the starting job. I'm not sure what their combine numbers looked like next to one another, but they are both around 215 - 218 pounds and both played in the SEC posting similar stats...
Tate - 678 carries, 3321 rushing yards (4.8 YPC), 24 rush TDs, 53 receptions, 336 receiving yards, 0 rec. TDs
Foster - 650 carries, 2964 rushing yards (4.5 YPC), 23 rush TDs, 83 receptions, 742 receiving yards, 2 rec. tds
Also Foster has been praised by the HC this offseason...
"Coach Gary Kubiak has been impressed by Arian Foster in OTAs this week.
Analysis: "(He) went from first year to second year a big jump, just (from) watching him practice," said Kubiak. Foster is taking advantage of rookie Ben Tate's (hamstring) absence. He showed enough late last season to believe he has at least a puncher's chance of starting in Week 1."
Tate is going to cost you a 1st round rookie pick.
Foster costs you next to nothing and if he doesn't pan out, who cares. The upside is there though and that's what I like...Edit: Also we have seen a little bit of Foster on an NFL field. 54 carries, 257 yards, 3 tds, 8 catches, 93 yards and 1 Fumble lost. Tate is still unknown in that department.