What firewall to use

[Edward Ingram]

We're a credit processing company and we handle direct debit, ACH, etc.  We store and handle extremely sensitive material such as credit card numbers, online accounts, etc.  And, of course, downtime must be kept to a minimum.   We're looking at a couple firewalls right now, and some may recognize my earlier posts.   One is a Cisco PIX 515 and the other is a GNAT 1000 box.    The GNAT is a less robust, but much cheaper solution.  Since we are a relatively small company, cost IS a big issue here, however, I would like to know which is the better solution in regards to security/price.    Any comments would be greatly appreciated.   Ed