The best replacement for pix is asa.

The best alternatives to pix are rated as following:
★★★★★  asa
★★★  flix
★★  checkpoint
★★  sonicwall
★  flix verizon
★  asa firewall
★  netscreen
★  isa
★  power shot
★  nhazul
  oreo
  pic
  cisco asa
  watchguard
  iptables
  fortinet
  fllffl

Your alternative for pix is not listed? Suggest!
Speaking about pix, one probably shouldn't forget about dmz.

Other search terms related to pix and their ratings are:
★★★★★ dmz
You have in mind a companion for pix and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of pix in all years. Click on graph for more.
pix
asa
flix