Hey Guys, thanks for the replies!
Ok, great information, thank you! I think I'll go for the 4 then...
I'm not positive of the exact placement, but I believe it will be something like this:
Incoming TelCo Line ----cable---->
2-Way Splitter----->1 cable to GW & 1 cable to USB Modem.
*
SEE IMAGE BELOW...
Thanks again for the replies, much appreciated!
Thanks,
Matt