[RUNNERBUN]

Hello Houdini and welcome to the Barn. You have done the right thing by coming to the Barn and joining a local Club. You will get lots of good advice from both.
16 or 19" wheels??? Ultimately the choice is yours. Both have advantages and disadvantages. The 19" is original and just my opinion look very much better that the 16". Personally I don't like the look of the 16" wheels but you will get a better handling and economy.
You are on the right track taking your time to decide. Talk to others that use the 19" and if possible try them on you car before making the commitment. If you intend to do big mileage trips then maybe the 16's are for you, if you will be using your car for shorter local club runs then the 19" will probably be a good option.
Good luck whichever way you go. Just drive it at as often as you can and just enjoy it.
Again, welcome to the Barn.