Can't say, who knows what they would have looked like in college and you have to remember that Rondo and Perk wouldn't have the "starter on an NBA championship" pedigree. Their draft stock would be based on what they'd done in college.
Rondo would probably be top five but top two? I don't see it. Rondo still has major questions about his jumper. If he went through four years of college and had never really developed his jumper, at age 23, he's still enough of a question mark that he's not the first point guard off the board. Ricky Rubio's five years younger with all the same upside and professional and international experience - he's still taken higher than Rondo. I think Rondo goes somewhere between 4 and 10 if you take his current skill set in this draft.
As for Perk, given that he has developed some offense and has shown a lot of defensive ability, I think top ten is a reasonable bet.
The only other guy who may go higher than where he was picked is Davis, who could probably crack the top 20 - mostly because this is a much weaker draft than the one he came out in. But who knows? He might have the exact same perception as he had then - too small and too overweight to be much more than an early second rounder.
As for Walker, Giddens, Pruitt - they're all at the same spot or lower.