Okyz I tested 4 different cards:

ATI 9000 PRO
ATI 8500 LE
ATI 9200
ATI 7000

The best one in pure performance is the good 9000Pro, but it's out of production and use a fan.
8500 should be fine too, but it has a high price (compared to the speed).
Ati 9200 is the medium Gfx board in 3d field.
At last the Ati 7000 is good just to start with and Ati board on the Pegasos.
Now, about the DIRECT support under Morphos, actually the choice (for price, performance and support is the 9200 (NOT SE), because it's in production and a 128Mb version price is less than 99 euros.
If you are lucky to find a 9000Pro around for less than 149E, BUY IT. It's gambling fast and a good choice when 3d support for this board will be avaiable.

PS
As everyone stated,is, anyway, clear that VOODOO are ACTUALLY the best choice under Mos, due the really good 2D & 3D support. The problem is that you can find Voodoo cards only in the Used market (take a look to Ebay)