Howya Neil,
The Wilson Flyer 17 is a grand stable fishing platform. As with all dory hulls it will slam like mad in the rough but it is a spacious boat that is stable at anchor. They have been around for years (as has the pilot 17) and can still be bought new today. The Seahog Sealord is a similar hull and I can vouch for the sea keeping abilities of this style of boat!
There is no real “standard” finish as they could/can be bought at whatever stage of completion you want.
Bottom line here is that you could do far worse than a Wilson/Pilot/Sealord.
As for courses, find out where you can do a RYA Level II up your way. You should get your info at:
http://www.rya.org.uk/Regions/northernireland/
Don’t want to sound patronising but make sure the budget includes all the gear necessary: VHF, GPS, Flares, Lifejackets, Compass etc.
Enjoy the trip; you’ll never look back once you get afloat!
:D