If you just want to experience a powerful amiga with networking, graphics card etc, right out of the box, you could just use UAE on your mac. Then you can keep your A1200 as a retrogaming machine, if you prefer.
This is good advice.
Expanding a 1200 these days is a waste of time/money (IMHO), either keep it standard with a few little updates (eg CF HD & IndivisionAGA) and use it as a games machine or get a new(er) machine and run your choice of Amiga OS flavour (or just WinUAE).
