I think with the position we're in at the moment, we need to be really banking on Tapine and K.Sims coming good and being at least first grade capable (not "first grade capable" like some of our current mob - but genuinely useful first graders that add something to the team). Hopefully we can pull another one from the lower grades, too. James Taylor immediately comes to mind, although apparently he hasn't set the world on fire since arriving.
Ultimately, we're not going to be able to bring in 5 quality forwards from outside. I think we need to pray for 2... 3 would be outstanding, and hope that the rest can come from within, or that a big shakeup of the pack will get more out of a few of our blokes like Rochow (who I could see being a middle forward long term).