With his high PSA and advanced Gleason score, and the fact that other tests were performed (bone scans, etc.), it seems like you're getting good advice from your urologist. Is the surgery open or robotic? That's one thing you didn't mention. Has the surgeon performed many of these? Good questions to answer. I personally don't think getting to the surgery early is a bad idea, given his scores.
One of the first things I purchased was Dr. Patrick Walsh's book, Surviving Prostate Cancer. This is a great book that could help answer a lot of questions. I would also spend these three weeks getting in as much shape as you can. Also start Kegal exercises now, which will help to regain continence following surgery. This is a scary time, but doing research and getting ready for surgery will reap benefits in the long haul.
I wish him good luck. Keep in touch with this forum.
Age 57 at diagnosis (2006), PSA 4.7 (up from 3.2 one year previous)
Biopsy November 8, 2006 1 of 10 cores positive 5% LEFT Side Gleason 3+3
Robotic surgery January 19, 2007
Post Surgery Pathology Stage T3a, Gleason 3+4, positive margins and capsular penetration RIGHT Side
Post Surgery PSA: March 5, 2007: 0.01 5 month PSA 0.08
Adjuvant therapy began June 26, 2007 with Zoladex injection
Radiation began August 23, 2007, ended October 8
First post radiation PSA, December 18, 2007: 0; March 2008 - still 0; July 2008 - 0; Sept. 2008 - 0;