I suggest skipping Young Team entirely and getting Mr. Beast and Happy Songs For Happy People. If you like those, you'll like everything else.
Get 65daysofstatic in order of release. The Fall of Math is an amazing debut probably has most of my favourite songs of theirs.
Silver Mt. Zion is tricky because they started out sounding one way and have ended up sounding almost completely different. The latest album is very rock-oriented, with loud guitars, and consists of four 13-16 minute stadium-rock level jams. The first one, on the other hand, is practically ambient with very sparse and downbeat piano and strings dominating. The three albums inbetween follow the transition from one to the other quite methodically. It's entirely possible to love some of their albums and hate others, I suppose. I'd get Horses in the Sky first, personally.