Which Cisco router will allow a dsl or cable WAN connection?

Basically all I wana know is which Cisco router's allow you to use a cable or dsl WAN connection im looking on ebay and I see alot about ISDN but not much about dsl or cable can someone help me out ?

As the 2500 has reached the end of life cycle I would go with a 2600 series or buy a PIX 501. you are probably looking just for something to do NAT any router can do NAT, just depends on how much you want to spend.

1600 series obviously there are also 1800 series. You can give a try on ebay po anthing like these cheep and fast ones.

Well I am wanting to beable to use it to study for my ccna so I want to beable to learn IOS and anything required for ccna certification

If you look up Cisco training kits on Ebay you will see several offered with routers and switches all inclusive.

For ccna go with a router then, PIX better for the situation, but it's not even mentioned on the exams.