Welcome!
I have just joined here myself and in a similar situation with my A1200.
I'm in the UK so I think Amigakit is looking like the best place to get bits.
I'm going to start with adding an IDE HD I think. Then maybe upgrade the Rom, add a new HD and maybe change my 16mb RAM to 128mb.
Anyway goog luck with the upgrade and do post about your progress or with any questions. everyone round here is friendly and don't seem to mind answering any questions.