As long as you never unplug your cable modem, it should be a fairly static IP address.. I says fairly static because its not TRULY static.. if you ever unplug, or disconnect your cable modem for a resonable length of time, your cable modem will negotiate a new IP address with your service (well ...
I dont know alot about your ADSL.. but I did read the ADSL forum like a year ago befroe anyone I knew had any idea what I was talking :\
Oh yeah.. thing with ISA, if you lose all cards in your ISA slots, and go all USB and PCI, you get 10% System Performance boost! Its not exactly on topic.. BUT ...