I admit I have been wrong all along.  I still don't have any concrete idea as to who it is.  I do however think that a key clue to finding out is determining how Red John knew which names Jane had picked and how he killed someone from his memory (a good memory that made him happy).  To me, it has to be someone that has hypnotized Jane at some point.  Red John has proven time and time again that he is a master hypnotist.  That being said, it must be someone that Jane has spent much time with..........most likely one on one time.

I am thinking Ray may be a good choice because he spent a fair amount of time with Jane alone.  He reasonably fits the description's given as well as age.  His name is Ray which doesn't deviate much from Roy.  Jane had said i a previous episode that people usually pick aliases that are very similar or have a connection to their own name.

Like I said......it is still a huge guessing game at this point.