Hey Davey,
There are a heap of brands to choose from but to narrow your choice down I would recommend selecting an all-rounder (for versatility, surf/flat). And stick to something 10' ft to 10'6 long, 32" wide and not an inch narrower and something in the 4.5-5" thick range.
These dimensions will give you plenty of float, for you and the famz and isn't to cumbersome for the lighter of the bunch.
The width is is the most important thing for stability and ease of use in my opinion so stick with 32" and you'll be happy as Larry. I slightly pinched out tail with some nice concaves will allow you to have fun in the surf.
Also in terms of strength and durability you will find the bamboo vieneer models (make sure its bamboo top and bottom, not just top, ie sandwich) is actually stronger than straight carbon wrap models and also much cheaper.
Personally I'd purchase new as you can get some old 2016 models cheap this time of year... But I've got a few boards for sale if your on the GC.. Nudge nudge

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Hope that helps narrow you down to some practical options, and happy shopping.