Hi triker, we're sorry that you were diagnosed with cancer. We are really glad you came to what I believe to be a very caring forum. There are a lot of good folks here who can help and support you.
I agree with the rest of the vets here, that once you're diagnosed with cancer, you probably have it. However, it does not hurt to get someone else to read your sides and get a second opinion.
In my case, I had a PSA of 1.1 in October 2006 and 4.3 in April 2007. I was very religious about getting a PSA test every year since I was 40 (am 54 now). My PSA's never exceeded 2.0, so I was pretty shocked at the quick rise in just a few months. My PSA was still "borderline", but my urologist/surgeon used her intuition and decided go ahead with a biopsy. She found cancer in two samples, <5% of each sample. By the time this biopsy was done and the results came in (June), I had already researched my options in case I found that I had cancer. The doctor told me she liked to do surgery for cancer likely contained in the prostate and for men as young as I, but that I should listen to what the radiologist had to say too, and make my own decision.
I later chose the da Vinci surgery and scheduled a firm date. It made me feel I had a direction. Then I sought opinions from other urologists I knew and trusted. Not only did they highly respect my surgeon, but they thought that the choice of surgery would be very good for my chances at a "cure" or long-term remission. So... I stuck with the surgery and I am very happy with the entire process.
Hang in there, and I wish you the very best in your decision making process.