It all depends on your perspective on the player. I find that blind bidding bears a strong resemblance to an auction draft - the larger money is spent at the beginning of the process, where owners see players about to emerge as major contributors (like the "big names" on auction boards) and worth a large expenditure. Other owners, most likely ones going 1-0, 2-0, 3-0 etc through the first few weeks, will hold money and keep it for leverage on a final piece of the puzzle-type player that can put them over the top later on down the line. Basically, the players that were going to fetch huge bid dollars if they WEREN'T drafted but through injury came to prominence were:
Brandon Jackson
Javon Ringer
Bernard Scott
Jacoby Jones
Donald Brown (maybe)
Willis McGahee
Peyton Hillis
Rashad Jennings
Kareem Huggins
Chris Ivory
Jason Snelling
Toby Gerhart/Albert Young
Anthony Dixon
That's just running through divisions in my head. Jackson's number came up Week 1; he's going to go for a premium. How much you bid on him depends on how you value him, how your team currently is constructed, and how you THINK the other owners in your league will value him. Keep in mind that the Packers will almost certainly be bringing in some RBs in the next 72 hours, but my guess is that you'll need to bid at least $500 to be in the conversation, and that's a conservative estimate.