After listening to a couple of Megadeth songs the other night drinking some beers, I sort of got back into them. I listened to Endgame (2009) and whoa, that album is a thrash metal roller coaster ride. I'd put that album just under Rust in Peace, and Peace Sells.
Speaking of the latter, I listened to that as well, and some of the riffs just groove on that one; I forgot how much I used to like this band.