That is terrible hardware when it comes to free software support. You will
not get any 3D acceleration from the Radeon card and your Wifi chipset is not
among the ones Linux-libre can drive (it requires a proprietary firmware):
https://trisquel.info/en/forum/searching-open-wifi#comment-54590
See this post as for more information on acquiring a Wifi card/adapter that
would perfectly work with Trisquel:
https://trisquel.info/en/forum/request-wlan-card-support#comment-55424
As for the graphics, you can get an nVidia card. The support for those cards
is far from perfect though. The most recent models may be even less supported
than your current Radeon card (fallback on the "vesa" driver). You can also
settle for your current 2D display and remember than, in the future, you want
to buy Intel processors. Linux-libre perfectly handles their integrated
graphical chipsets.
