The PIX Classic was the PIX before models 520 and 515. It was around about 4-5 years ago. Cisco EOL it a couple of years ago. The reason I know about it was because I had one. It cratered on me and since Cisco EOL it, they gave me a PIX-520 for a replacement. I guess I had never looked at the PIX 501. Looking at our pricing sheet I can get one for ~$400 for DES capable and ~$485 for 3DES capable 501's. I'm always looking at the 515 and higher models...

That would be the way to go for a small office. Here is the spec sheet on the 501

Cisco PIX 501 Data
Cisco 501 PDF Doc