I think we got our Shawn Marion in the draft, Earl Clark will likely fill Marion's role of defending the other team's best perimeter player/letting Nash feed him buckets on offense/rebound. I think our starting lineup is still very potent, and our bench is arguably the best we've had in a long time.
All we really need is a ground and pound center. A guy like Kendrick Perkins (no chance of getting him though), a guy like Tyson Chandler (

). Yes, Nash is aging and Dragic isn't proven, but I think with a year under his belt and Gentry's confidence in him, he will become a good backup PG.
Defensively we don't need to be anything special, it just needs to be solid and I think we can become a solid defensive team with a good defensive center in the middle.