There's the one and only AMD ATI left. For catalyst-rt, it's a sad case since catalyst itself is a sad case. Apparently, the xorg team has been doing a wonderful job with xf86-video-radeonhd.

For non-discrete solutions, it seems the latest Intel offering offers a fair performance chart relative to mobile nVidia, ATI, SiS and others. No problems with drivers there although xf86-video-intel needs some smoothing out.

I switched from nVidia to ATI back in 2006. I then went on to use an older laptop with nVidia's mobile 440. From 2008 I've been with an Intel-based laptop (GMA 950, 945 chipset) while the two family desktops at home are running GeForce 7800GT and Radeon X800GT respectively.