Definitely trade #12 straight up for #24 every year. #12's got a bad run going on.
#24's grabbed - Latrell Sprewell, Sam Cassell, Andrei Kirilenko, and Kyle Lowry.
Between 1990 and 2010, there were 14 all-stars taken in the second round or undrafted. To name a few: Marc Gasol (#48, 2007), Paul Millsap (#47, 2006), Mo Williams (#47, 2003), Kyle Korver (#51, 2003), Carlos Boozer (#35, 2002), Gilbert Arenas (#31, 2001), Mehmet Okur (#38, 2001), and Michael Redd (#43, 2000).
I think for the Blazers to be a 'contender' (conference finals minimum?), they need that second all-star.