I agree with you on Benteke and Weimann.I still think Gabby could be an important squad player for us. I don't trust his finishing (or fitness) enough to rely on him as a main striker all season but if we use him away from home/against strong teams/those that play a high line he can still be very effective. Ideally I'd like to see him on the bench for most games and then bring him on at around 60-70 mins to run at tired defenders.I think Bent is pretty much done at this level. He's lost a little bit of his pace since the injuries of the last few years and his lack of work rate (meaning you effectively play with 10 men all game while he waits around for a tap in) mean I think we're generally better off without him.I also like Kozak (I see him as another 10-15 goal a season striker if he stays fit and gets decent service).I think some combination of Kozak/Weimann/Gabby and maybe Robinson and Bent will do until Benteke comes back. Ideally we'd be looking to upgrade on most of them but I think given the situation with the sale and finances we'd be better off looking to strengthen the midfield and full back areas than going after more strikers.
I think we're ok, as well as the 5 mentioned, we have Robinson and Helenius and Cole and N'Zogbia can play in the no. 10 role meaning some games we can just play one up top with one off and not 2/3 strikers.
I agree, getting Delph and Vlaar tied down to deals and sorting the midfield is critical.