Just celebrated two years since my final salvage treatment this week. Happy to report no major side effects during the IMRT or after and I am still good to go on the erection front as well. I did go through some periods during the past two years where I felt I might be having slight ED issues but in retrospect I think it was all in my head.
I happen to agree with your aggressive approach on treatment as I did not wait for much of a psa rise before I took further action. There is mounting evidence that radiation following surgery significantly improves survival even if it doesn't cure the disease which to me makes the radiation worth the potential side effects.
If you are young then I think you need to go after the disease aggressively.