Welcome back! And a wise decision it is :-)
Jumping right at your question wether new Amigas can still be bought. Well, not the way they have been available. If it's brand new hardware you're after you might have to assemble a machine by yourself using new spare parts that are still available (in tiny, tiny quantities). As I don't feel like advertising here on the forum, send me a personal message and I'll point you to a site of a thrustworthy dealer who seems to stock the parts for A1200s, he might even be willing to assemble it, he could even discuss the possibilities.
If it's not needed to get brand new, go for a standard version from eBay. A clean, solid A1200 shouldn't break the bank.
That's for the serious 'getting back' situation. There's also an admirable project going on by a member of this very forum. His name: Dennis van Weeren. His project: Minimig. There's a good 52 page long thread about it on the forum. On Wikipedia there's a good article about the Minimig as well.
Links:
WikipediaAmiga in FPGA: MinimigPersonally I never took much fun out of emulation using UAE. Always something seems to be out of tune runing the experience.
