After Rondo, I'd probably rank them KG, Ray and Pierce (he'd be right behind Rondo if it wasn't for his contract). KG's a difficult acquisition though due to salary matching and the amount of money he's making.
Then Bass, then Wilcox, then Dooling, then Bradley & Johnson, then JO. Leaving off the minimum guys.
Most likely to be traded is JO, hands down. He was already almost shipped out in a sign and trade. He has the largest disposable expiring contract.