Even though we may have a "war chest" to spend, I still don't really see the need to spend a significant portion of it on a top class CB like Hummels for example. I'm of the opinion that Jones/Smalling/Evans are good enough to be starters here and if we brought in someone like Hummels who in fairness is better but also quite young himself, when do Jones and Smalling become ready to be our starting center halves? And it would be quite naive to think that they'd stick around much longer continuing to be squad players like they have been.
I understand everybodys fears because all of them have a history of being injured and sometimes having 5 centerbacks on the books wasn't enough. However, I question whether that has more to do with constantly being rotated more than anything else. Centerback has been a constant source of injury and I think it's no coincidence it's also been the area where we rotated the most. Players who played regularly like Evra, Carrick and Valencia seldomly get injured, whilst players like Nani, Anderson, Young, Jones, Smalling who are in and out of the team, seem to be the ones who are usually injured. Just a theory and by no means a proven fact, but if this is true it would sure save us a hell of alot money.
Then there's also the pleasant news that we might actually have a competent midfield for a change. Don't discount how important a great midfield helps out defense tremendously. We can look at the likes of Bayern or Barcelona and what peoples perceptions of midfield for us is, is the same as what defense was for them. People constantly say they need a better CB and some defensive displays have been comical, but overall they keep alot of clean sheets and win games.