VErtongen would be an improvement over out backup but, first team is Verm/Kos, Mertesacker is on around 80k a week and we have little to no chance of offloading him, Djourou just got another new contract and is of Wenger's "favourites" and Squillaci even Wenger has given up on. However what we're doing right now is essentially stuck with Squillaci but got Mertesacker anyway, no chance we're going to get another top CB, as in no chance at all. Squillaci being off the books if we can manage that just brings us to 4 CB's of which 2 are very highly paid and two are making a decent wage, no room for anyone else but younger/cheap CB's like Miquel.
Podolski, is to a degree unfortunately having a fantastic season, theres going to be more interest this year than before and he might get better offers, he might just decide he prefers Germany. Not to mention the Euro's, clubs and players often wait till after a cup as clubs go a bit mental over anyone that has a decent international cup performance.
Hazard, could be fantastic but Nasri looked much more "epic" while playing in the french league, as do most people playing over there, 30mil odd is a big risk on that kind of a player. Can only really see him being seduced by the money eventually, Real, Bayern maybe, City, Utd possibly. If Robben ends up leaving Bayern they'd definately be in the market for that kind of player and they have the money, huge club.
As for Wenger's French league/french players knowledge, Nasri played out well because a stupid club paid us too much, Diaby, Traore, Squillaci, Gervinho, Chamakh, Sagna, sure theres a few youth players I've missed out but, by and large the vast majority of recent buys having anything to do with France, have been crap.
Still not seen any real indication Santos is any good and Gibbs is still made of Glass, left back is a key area to strengthen, and if not Podolski then another winger. Again we'll probably have little chance of offloading Gervinho, and AOC should be getting more games, but that basically leaves us with AOC/Walcott and one of those is useless.
Arsenal could do with selling Gervinho, Chamakh, Squillaci, Diaby, Denilson at the least. Vela/Bendtner if they won't get given games as well.