If you can find a Viper 520CD (or even better the extremely rare Viper 530) and a 2Mb megachip board, then it's fairly easy to get an A500 on the internet. (I'm using an A500 to type this)
Unfortunately these things are rare and expensive and you only get a maximum of 16 colours to view web pages. Other expansions are also limited.
I'd say you should get an already upgraded A1200 and save the expense and pain.
