Excuse me, but why bother? Use it as a games machine, there is hardly any development on classic Amiga.
Load it up as a backup computer.
There are diverse motivations on this site, not everyone is a gamer (I never would have found the Amiga or cared for its unique OS and hardware, if I had approached purely from the game direction).
@ runequester
Apparently, MasPlayers have again become hard to find, but, they work well even on stock A600s. There is another hardware Mp3 decoder that works with the Amiga and C64, too. I forget the name as I have no experience with it.
You will probably want the ram (acceleration, too) to improve web browsing. That's the catagory that continuously sprouts new standards and complexity (some call it innovative). Everything else you want to do will probably involve less compromise.