Hi PTWoody,
Like me you are a light guy, I'm not sure you need something with as much volume as the Mana. I haven't tried the Mana and I realise that you aren't going to be burying the rail for a while but I would be a little careful about going too fat. While the 12' Glide is not perfect in the surf it is actually fine for the smaller waves and will give you a chance to get your surfing legs, it is also just a great all round board.
My first surfing board was the 9'6" Naish, felt small at first but pretty soon it felt huge on any sort of real wave because I only weigh 66kg. You are very welcome to borrow my 10'5 Starboard Drive, it is 30 wide and has quite fine rails - super stable and fast. If I could only have one board that would be it.
But.....I would go smaller
The 9'8 x 30 Element or something similar will give you heaps of stability and you will won't grow out of it too soon (OK I have a Starboard thing!)
Of course there are all the other options out there like the 9'6 Naish and the other smaller Naish boards and the PSH etc etc. Big brands, you pay a little more but get a known product with good resale.
Why don't you take a ride down to to Deans place one day and talk about a custom "woodie". I wouldn't be rushing into something too big. PM me if you would like to borrow the 10'5 or the 8'5 Pocket Rocket one day.
Cheers,
Jonathan