I use a 1-1-1 mix of peat moss-perlite-vermiculite like many others. It works great and it's not too expensive either. A small bag of each when mixed will make quite a lot of potting mix. Make sure to get the small bag of "peat moss" as this has been milled. The large bales of "sphagnum peat moss" often have not been milled and are too coarse for AV pots. Hope this helps.

A lot of my friends use Promix BX as a base for their mix.

thank you for the recommendations. I will remember to look for small bags of peat moss and not the bales.