If I were Danny Ainge, this would be the order of what I'm looking at:
1) Re-sign James Posey (he is just too important for us, his defence and timely 3s~ I cannot see another free agent out there as capable as he is)
2) Sign a big man along the lines of Kurt Thomas- a defensive veteran big (and the Birdman is not one of them, although he might be enough to fill the void left by PJ)
3) Re-sign Eddie House (he simply was a great fit IMO)
Of course, as you can see, I'm trying to keep the same structure as the team past season, as they say, if it ain't broke, don't fix it.
And our lack of athleticism is solved by our rookies IMO.