I would definitely prefer right foot on the left as well..but my problem is we have no cover for messi. Its a tough one because its a shame to bring in a player who has no experience of la liga (ribery) and get him to replace henry who has been on fire. Titi has earnt his right to be in that forward line. I feel if we have a foward 5 of messi, silva, CF, henry and A.N.Other (e.g. bojan) then we will be covered and can rest messi and the left-footed silva can fill in for him, and we can also play silva on the left if we need to stretch the play.
Im not against the purchase of ribery. He is a quality player for sure. I just think our more pressing need is a left-footed playmaker that can play on the wing. Silva fits that bill to a tee.