You get what you pay for. If you plan to actually get out there and do it, spend the money and go to a paddleboard shop. Also get educated on the right size/style board for what you want to do.
I love the Riviera brand and now own 5 boards of theirs.
The 8'6" El Tigre is my brand new surfing board. Thing shreds.
The 9'2" Carbon Turbo Nugg is my other surging board. I'm in love with the El Tigre, but will keep this board for smaller days. Also will be a great board for my 3 year old son next summer.
The 10'6" Riviera Select is my hybrid board, I have done over 8 miles of river paddle on it, and can also catch waves. This is the board I bring out most days.
The 11'6" Riviera is my coastal cruiser. I've caught a few waves, but mostly just flat paddle this big girl.
Then my tank is my 14' Riviera Voyager. This is my fishing board, also can handle my wife, me and 2 young kids on it. I've also used for a 3 night paddle/camping trip and was able to handle all my gear.