Double blade paddle for solo canoe

I have a 12' Placid Spitfire. Altough I really like a single bladed paddle, I'm considering a double blade for overall efficienfy. I''m 5'10" tall, 72 yrs old. Am looking for recommendations for both length and brands and models. I am not interested in spending multiple hundreds of $, but of course I'd like light weight, strength, etc...
Thanks in advance for positive recoimmendatioms.