Lots of Paddles on the market...
Mariner sails in Dallas & Mountain Sports in Arlington keep a nice selection in stock. A 240 length is n good all around length for me. Longer gets in my way n shorter makes me stretch out. Have owed several even an organomic carbon fiber. To each his own. I prefer a straight shift over organic but, like carbon fibers weight over a plastic n aluminum. I prefer a flexible blade over a stiff blade but, I have both. I also prefer a round paddle shaft to an oval. If u buy a good name brand paddle they will likely replace it at no charge if it is defective or breaks under normal use (Not abused).
Werner & Aqua Bound also make some nice ones. Don't recommend a big blade unless u have guns like the Dwayne Johnson. A medium size blade is what I prefer.
If u r on a tight budget u should try an Academy 240 length paddle. Be sure n buy the lightest weight paddle u can afford. U can always mark your paddle at 10", 12", 14" 18" & 24" etc. yourself depending on what fish u intend on harvesting or CPRing