Maybe I'm deluded, but I would say we are challenging for top 4 this season (I think we will go on a bit of a run now). CB is by far our biggest weakness so if we got two in I'd say its a bit defeatist to say that would make us challenge for top 4.
The way I see it, there are four key deficiencies in our squad. Right back, the two centre backs and AM. We may already have the cure to our number 10 issues if one of Dele or GLC is back up to speed next season so it's in defence we need to strengthen. I actually think the rest of our starting line up are good enough outside of those areas to be in a team challenging for a title. Hugo is the other question mark but looking at the other keepers out there I don't think there are too many attainable ones better than him.