Not at all familiar with his work. Which album should I start with?
Not at all? I had always thought everyone knew Keith Green. His most famous song is "Lord, You're Beautiful" Check out the Ministry Years collections, between the two double albums you will have all his songs. His career was cut short by his dying in a plane crash, unfortunately. While his music may not be extremely "arty", I enjoy its woshipfulness(and I don't like modern worship, BTW). Its also pretty funky, alot of times, something you don't get much in Christian music. Check out this pioneer soon.
[EDIT]
http://www.grassrootsmusic.com/artist/green The Ministry Years Volumes 1 & 2 will get you all his songs for less than $30