Clifton Chenier 'cause my grandma was a Chenier. Try "Bon ton roulet" on Arhoolie. It may be a little too authentic if all you have to compare it with is Buckwheat Zydeco, but since you seem to have first hand experience it may not set you back on your heels. Joseph Falcon & his Cajun Band, also on Arhoolie. I have no idea if the stuff is available on CD though. And no, my grandpa wasn't a Falcon... Less authentic, but with roots firmly in Louisiana is Zachary Richard, certainly worth a listen. And by all means, laissez le bon temps rouler!