I think we need Perk's defense more than we need the #4 pick, even if Minnesota would do that trade.
I think whoever is taken at #4 will probably be more talented than Perk, but he won't be as proven or as good a fit on our defensive front line.
It's a smart move if you're looking to rebuild. If possible, though, I'd like to see us try to extend our window another year or two, rebuilding be [danged].
I understand where you're coming from, but if we had the chance to add the player that can both extend our window and be a great piece for the future, would you trade Perk for him? I would, and here's why.
Perk is a role player whose value, like Glen Davis' last year and maybe Tony Allen's this year, will never be higher. You also have to look at these players and decide if they will be a future allstar/starter or just a role player on a championship squad. To me, we can replace Perk with Jermaine O'Neal for a year or two while we bring Greg Monroe off the bench for the first couple of years.
I also think that Perk is enticing to a team like the Pistons who are looking for toughness, according to Dumars, at a reasonable price. It's no secret that Joe D. liked Glen Davis last year and would probably love to acquire Perk, who fits the mold of the traditional big man for the Pistons, while at the same time helping out their cap situation because they're not in a good spot right now and probably need to cut costs.
Now, would Joe trade the 5th pick to us? - probably not, but I would still look into it if I were Ainge (what do you have to lose?).
Bottom line - we should buy as many picks as possible and get as much talent as possible. See if Memphis is willing to part with any and all of their draft picks (I believe they are). I mean, if we traded for the 5th pick and then bought Atlanta's pick, Minnesota's picks (16 and 23), and/or Memphis' 25th pick, we could possibly come out of the draft with Monroe, Babbitt/George, Avery Bradley, Lance Stephenson, and Willie Warren. All that's left to do is fill in the remaining holes with a couple of veterans, like Jerry Stackhouse, Raja Bell, and/or Kurt Thomas (among others).
Just a thought.