hardware needs for ccna prep

[Daniel Luke]

I'm trying to find out info on what I will need in the way of hardware for preparing for  one, and preferably more of Cisco's certifications starting with the CCNA.  Is more than one router needed or recommened for simulation and training purposes?  What should be the least amount I could expect to spend for the basic equipment needed to get started?  Could I use the computer I currently have (a Dell Web PC) with only usb ports as the interface/terminal/server?  What is generally thought of on-line router practice such as the service offered by virtual labs?  I realize there are many questions here, but if anyone has suggestions on any one thing, I would be very grateful.  Thanks