@Jethro_Tull
IMO you're picking the right Amiga - you probably won't want to expand it so much to add a graphics card so you need the best custom chipset - AGA. The A4000 is probably far too expensive, so definitely go for the 1200.
That sounds like a fairish price, but have a look around - I got a slightly expanded A1200 with multisync monitor for £40 (€58), and it would definitely be worth paying that little bit more for something thats expanded.