I like too many to think about a specific one.
The only album I did not buy was "Rocket Cottage" I thought it was crap at the time. I wish I had bought it now.
Now we are Six, Below the Salt are a couple of favourites.
Picked up a compilation recently with Maddy doing "Twanky Dillo" with just a drum accompanyment absolutely brilliant.
"Somewhere Along the Road" is one of my favourites, although that is just Maddy I think not SES. Rick Kemp did write it though.