Please! help on Modem -not a winmodem post-

[alkalinelito]

I'm going to buy, a modem on ebay, yeah, i finally want to conect to the internet, throw linux, and get rid of windows .
I have a few question , ALL ISA modem should work on linux ??, wich PCI ones are good? , i know that all serial external modem works, but they are more expensive.
thanks

[Zarthul]

I have found this site to have a good database of which modems work and which don't http://www.idir.net/~gromitkc/winmodem.html