OK you guys, I think you went way over the top.
If someone asks you about how to upgrade his car, du you recommend him to buy a Ferrari right away ?
What you say might be good for an absolute freak that is experianced and doesn`t care that much for money, as the solution you tell him cost several hundred EUR/Dollars.
As for Graphicscard, the A2000 Takes Zorro II cards only, the A4000 can Handle Zorro III cards and is backwardscompatible with Zorro II.
So for an overview of various GFX-cards have a look here:
http://www.amiga-hardware.com/showcat.cgi?CATID=16Or to summ it up recommendet GFX-cards:
Piccolo
PiccoloSD64
Cybervision64 (A4000 only)
Cybervision 3D
GVP Spectrum 28/24
Picasso IV (good but expensive)
Picasso II / II+ (only recommendet for A2000 as it are ZII only cards)