I'd rather Hurley than Delaney, but it all depends on that ASADA investigation.
As for back set ups... You would think that, from the current stock, Roberton and Dempster are instant inclusions. Gilbert's been in prime form since he came back, so you'd include him at the moment. I have doubts over whether Chips can be effective next year, but you'd think that if he keeps his fitness and is injury free, he'd be given a spot. That's already 4 pretty tall defenders, but 4 that aren't really suited to playing KPD.
Geary will most likely play next year on the wing and through the midfield in a tagging role. One back position will likely be taken by one of Webster, Newnes, Wright, or even Dunell if he can break into the team, as a spot where those younger, more defensive mid fielders can develop. Siposs should be played as a forward (and is best 22 when he isn't injured, IMO), as should Stanley.
That leaves Gwilt and Simpkin (unless I've forgotten someone). I think that Roberton took Gwilt's role in the backline, and while Gwilt has been played out of position for two years now, it may be best for all parties if he moved on next season. He's come a very long way since joining the Saints, but he may find a better suitor elsewhere. Collingwood, for instance, might be interested in him, given that they're likely to lose Shaw, and Maxwell doesn't have much left in him.
A few pages ago, someone (sorry, can't recall who!) suggested putting Simpkin in a defensive forward role, which I think could suit him. He's got good enough skills for it, and could apply a lot of pressure to otherwise loose defenders.