A few weeks ago I'd have agreed with you about the defence, but that was before Dunk looked so at home at this level. I think having him, Greer, El Abd and Elphick is probably enough at CB, and we have Calde, Painter, Vincelot and Tanno at full-back.
Not saying I wouldn't like to see us strengthen, but I'm not as worried about it as I was.
On keepers, I don't think Ankergren has done much wrong. Don't see any need to replace him.