Use the tool at
Basketball Monster to help your decisions.
Make sure you don't draft guys who put up numbers in 'sexy' stat categories but kill you with turnovers, low fg%, etc (I'm talking to you, Steve Francis!).
I was able to pick up Webber in the 8th round in my Yahoo league. After his monster game last night, that might not be possible.
Donyell Marshall is always an efficient all around player, and will usually be available mid-late. Others in this category are Drew Gooden, Raef Lafrentz, and Shane Battier.