Considering that R22 has recently doubled in price, and in another 3 years another annual production cut back is coming, which could double its price again. Staying with R22 is not really a great idea.
All I install is 410-A when I do a condenser and evap replacement now. So much cheaper.
I was at Lennox Parts Plus today, jug of 410-A was $130-ish, R-22 was $365, on sale.