I have taught 440 people to surf in last 3 years, and I own 20 wake surf boards
Marco Thompson, 619-518-3001, email@example.com
Liquid Force 5'3" best for your wife, OK for you. LF 5'6" best for you, OK for your wife.
2nd choice, LF 5'2" nose rider best if you have great size wake, LF 5'6" nose rider if you have average wake
When you progress, I would look at Walker Project Bomb Pop, and some of the LF advanced boards.
Come visit San Diego and ride this winter as my guest if you want to try any of the above.