Mr_B, since your swedish, surf over to
www.ggsdata.se and have a look at their line of products. They got all you need to upgrade your Amiga to your hearts contents. You can even mail the storeowner and ask what you need and he usually mail back some good advice on what to get and why you want to get it.
It must certainly be the best Amiga store in sweden with the greatest support and staff.. :-D