I'd say #3 or #4 if we're talking about today's conditions. Djokovic and Murray are roughly on par with his ROS. Djokovic hits very well off both wings as Agassi did. The problem is, even at his peak, Andre was never a very good defender. He was very quick early on in his career, but just lacked defensive instincts. On the slower surfaces of today, he would have to try and hit through these guys a lot, and I don't see it happening enough to challenge for the top spot. If it was the quicker surfaces of the 90s, however, it would be a different story.
"I can cry like Roger, itís just a shame I canít play like him." - Andy Murray