As far as my limited experience, I would go for the PIX. The PIX may be sucky, like Negrita says, but it is by far the industry standard, and the most effiecient out there. I hate to get into all cliches and everything, but you get what you pay for.
Cisco is a lot of work; you'll need to do your homework on it, but I'd bet that anything you need to do, a PIX will do it for you.
My 10 cents.
MCP, MCP+I, MCSA, MCSE(NT4/W2K), CCNA, CCA, NWCCC, VH-PIRTS, CEH
"hackers are like jedi, crackers are like the sith: do not fall prey to the dark side".
From 1337 h4x0r h4ndb00k: "the ten laws of geek", law x