Same situation as me. If you wanted to write off your 9th forward line position and take a 72K player then take Valenti. He's your best bet at bottom price but he most likely won't play. In saying that though I can't find anyone at the 83K mark who will play so writing off your 9th forward might not be as bad as it sounds.
At the 83K mark you have Edwards, Weetra, Jacky and Ross who have all played 2 or 1 games. I'd say maybe Edwards is the best of the lot there as he showed a bit pre-season and Carlton are pretty injury plagued at the moment.
Others to look for are:
Sellar: Although it sounds like his form in the SANFL has been shitehouse.
Neagle: 91K player who looks alright. Might be injured ..not sure.
J.Morton: Will struggle to get a gig at the Hawks but they might squeeze him in for the sake of blooding a player later in the season if they are home and hosed.
Veszpremi: Top draft pick. I have to assume he's injured but could come in to contention later.
Guy O'keefe: Ripping it down at Williamstown. Might be behind Callan Ward to get a game for the Dogs but sounds like a player and might get a game later in the season.
I am looking for a rookie forward too. If Valenti gets promoted (surely he will), i think he will get a fair few games considering their position, playing the kids. I think he could score well a is the best option considering his price.
Also i think you have missed probably the second best option Lachie Hansen. Yes he plays for the Roos but surely he will get a game soon, he was a high pick last year and with Edwards out for the year, there is a chance for him to break into the 22.