Hello and Welcome. One important factor is room size. I started with M22's and a sub, but felt that something was missing so I upgraded to 60's with the sub and instantly got what I was looking for. So of course I am going to recommend you get the 60's. Enjoy them to their fullest, then buy a sub later and enjoy them even more. Sub will add to movies tremendously and music significantly. I do still at times prefer to listen to music in direct mode with no sub and the 60's fill the room wonderfully. But I love having the option of a bit more hard hitting bass. (Which my HSU sub takes care of quite nicely).
The more I think about it the more I want to urge you to get the 60's. They can truly stand alone and sound incredible.
PS I still have the 22's for surround which I love them for.
