It took me awhile to get into their UK-style prog mixed with Southern boogie, but now I absolutely love Kansas. Leftoverture and Point of Know Return get the most attention, but I think Masque and s/t debut albums are just as awesome.
Funny thing about their big hit Carry On Wayward Son... it's a little misleading to new fans because the song is not truly representative of their basic style. It's much more heavily guitar-driven than their usual sound.