I just got into descent myself this month (bought an almost complete s1 set and 2 copies of s2). I bought shadows for the berzerk mini and labyrinth of ruin (great minis, great expansion), but my favorite add on was lair of the warm - highly recommended!!

The minis had almost no flash, sculptors are great, and the expansion is geared towards dragons... and dragons/dungeon crawl games go together great! !