Actually, I did think of a follow up question. Right now, I have all 4 drops in the house behind the same amplifier, which I did yesterday as a test. However, it was originally split before the amp with one line going to my office (cable modem is there). I've been finding conflicting answers in my research, but if you're going to have a cable modem behind an amp, is it passive or active return you want? My upstream bandwidth seems the same both in front of and behind the amp (according to speedtest at least), but is the modem having to work harder or anything?
Remember, no matter where you go... You're not where you were anymore.