Your best bet is with an nvidia graphics card (or integrated graphics card). There are official nvidia drivers available for freebsd. Check the compatibility list at nvidia: http://us.download.nvidia.com/freebs...ppendix-e.html
You should also consider getting out of the box a compatible network card (many users that find out they have to purchase an additional nic, consider this a deal breaker)
Also, be aware that many flash card readers won't work.
Getting the model/maker of the chipset in different components might provide difficult since some manufacturers/dealers won't provide that information upfront. This seems to be standard procedure.
Just be aware that even though moist of the time your hardware will work out of the box, you might get unlucky with some componen with is not supported. Don't give up.