You have made popular choices so far (propecia, nozoral and minoxidil) and these are the most proven. As minoxidil is new for you it would be reasonable to wait 6-12 months and re-evaluate whether you need more agents, as "stepping up" can keep you from ending up on too many medications which will have to be taken indefinitely.
Another way of approaching the problem (my way) is to take everything that makes sense with a plan to stop them all when you give up hope for maintaining your hair. I chose the latter approach as I only get one shot at this. I believe that in addition to your current treatment you might first think about...
1) tricomin (a copper peptide spray)... It is convenient/ no mess, and is a scalp conditioner. A phase II trial shows it thickens hair shafts, working as a "growth stimulator."
2) Topical spironolactone or Fluradil are probably the most proven androgen blockers, if you want to address DHT topically (to assist the propecia). ( RU falls into this catagory, but is experimental and hard to get.) I have more confidence in them than the "herbal" topicals like crinagen, but maybe there are studies supporting herbal ingredients and azelaic acid which I haven't seen... The benefit of COMBINING topical and oral DHT blockade isnt proven but makes sense if you want to go that last yard.
3) Retin-A may have additional benefits... It can come combined with minoxidil.
It would be easy to get on many expensive/inconvenient products. The trick is to find the minimum effective program. Unfortunately that is probably different for each person, so learn all you can, and... Good luck.
