Like others have said, I'm sorry for the reason you needed to join and I'd like to personally welcome you to this forum. Please take advantage of all the resources available here.
Based on what you have said on your diagnosis, you have a good number of treatment options available to you. You may also wish to create a personal profile, a signature file, as you see other members have done. This way, we can see a little of your history at a glance when responding to your posts in the future. The signature is totally optional.
HIFU is a very interesting new treatment that is showing promise. There are other less invasive treatments as well, that you may consider. Bronco suggested the proton radiation which has a good track record and others here are choosing Brachytherapy instead of surgery. You may view a brief summary of some of these treatments here http://www.prostate-cancer.com Other treatments are discussed in the forum and are referenced in the resources links and helpful hints topic at the top of the site. The main thing is that you feel comfortable with the treatment is the right one for you. You have some time to decide.
Please stay close and ask any questions that you wish.