Hello Mike, a word of caution re the nomograms. The Memorial Sloan Kettering website links to several as well as providing its own. They measure general life expectancy, prostate size, PSA doubling time, pre-op and post-op survival, plus survival after salvage radiation.
They are all well-researched, based on large samples and are generally quite applicable across the pond. But I would stress that most of them depend on various clinical inputs - such as Gleason score from biopsy - without which they simply cannot work.
It sounds like you have a rapidly rising PSA and if your urologist ordered an MRI then the assumption must be that you have PCa indications which need to be investigated. He may next suggest a biopsy and, possibly, a bone scan to assess whether there has been metastasis.
If you go for the biopsy and the Gleason score is high then it would be good to talk to both a surgeon and an oncologist. The reason? The first branch in the forking paths that is PCa will be: cut (surgery) or burn (radiation) It is important that you have both options clearly on the table if there is any suspicion that the cancer has got through the prostate wall.
I opted for the Da Vinci cyborg operation. I was similar age, similar PSA level as yourself. The MSK post-op nomogram combines several variables and can give realistic estimates. These are, however, merely probabilities, not certainties and should be seen as ranging shots, giving a general idea of future prospects.
Now that you seem to be treading the prostate path - its a perfidious little beastie the rogue cell - you will have a lot to take on board. This site is very helpful with a vast amount of useful information to be winnowed out. Hope you find this contribution helpful.