Hi Hugh, welcome to the club.
Re righting a GP14 - how would you rate your sailing skill level? Although the GP is a bit heavy, I think most people would be able to right one in 'normal' conditions. I (about 11 stone) have righted the boat in a force 4-5, scooping up Shae who is considerably bigger than me

But in a force 5-6, we've seen even experienced guys struggle to get the boat up. I'm guessing if capsizing is a concern for you, you won't be out in those winds until you've got some experience.
I wouldn't consider a Mark 1 boat, as they come upright with a fair bit of water in, increasing the chance of further capsizes. Mark 2s come up dry.
If you're not sure, introduce yourself at the club and have a chat. Best way to be sure is to give it a try - but maybe wait for warmer weather. The GPs will be down on Saturday and Sunday.
For ease of righting of the boats at the club, the order would probably be something like:
Optimist
Topaz
Laser 1
Mirror
Laser 2
RS500
RS400
GP14
Fireball
Wayfarer
Mermaid
Of course, there's also the question of keeping the boat upright in the first place- Laser 1 rather more tricky, GP14, Wayfarer, Mermaid rather easier, than those positions.
Cheers, and good sailing.