Depends what you are using your A2000 for. If it's mainly for games there is a good S-Video adaptor available which will give you a good picture on a good TV.
http://www.amigamaniac.com/RGB_to_PAL_NTSC_adapter.htmlI have a V1 and V2.
Otherwise there are lots of video/RTG cards out there for the A2000.
A2320 - CBM Display Card that fits in the video slot to the right of the Pwr supply. Works well on old CRT Monitors.
Picasso II, III, IV + others.
These cards can go for $100s on ebay.
Then there is the Indvision ECS....
Have a look here for the different types sometimes available:
http://amiga.resource.cx/exp/gfx