do you mining for invest? or mining for learning bitcoin? or maybe you mining just to get profit?
if you mining for invest, then i recomended for it better you buy bitcoin right now and invest it for 5year.
if you want to learning just buy 1 card, try it yourself by diffirent algorithm
and if you want to get profit, is not easy as you think, calculate your electric cost, calculate your maintenance cost and of course you must try diff algorithm to get "perfect profit" like mining when new coin release and hodl it.
There are many promising projects which, if it is good to mine in ten years, will cost a lot. Starting from veil and grin and ending with ravencoin and beam. It's never too late to start.
The main thing is to correctly calculate and understand technology.