I would go after brook lopez or Big Al....how many good 7footers are there in the NBA?
and I think having someone who can finish in the post would do wonders for this team(either now or in a rebuilding effort) when rondo drives to the hoop to have someone who can get it in
Big Al's seven feet tall now? 
lol made a mistake there...but either way.
Id like danny to build the team much like the Grizzlies have built their team...alot of really good players(maybe not superstars but all-stars) who play like a team...that grizzlies team pushed an OKC team with superstars to 7games through solid team play.
I think Al Jefferson/brook lopez are solid players...who if you can sign them for a reasonable contract I would take in a heartbeat.
and in lopez' case hes only 23years old...theres a pretty high ceiling for him to get better and improve his rebounding.