We use 2 Cisco PIX 501's in front of a couple of our web-servers up at a data-centre (two separate installations on different IP ranges).
Touchwood they're fine but, if we had to replace them - what are our options for an equivalent replacement today? When we bought these I remember the spec saying they would comfortably support 10,000 simultaneous connections. Is the ASA5505 the equivalent today?
 I'm not against other manufacturers - just that the pix is what we have and we know a CCNA(?), albeit certified in 2003, who configures and administers our pixes.