nextel PTT about killed the CB in my part of the country, but it aint completely dead. Hunters, 4x4 clubs, truckers and a handful of grumpy old bastards with base stations still use it.
Not much else besides a high power CB will go beyond the 5 or 6 mile horizon. Lower frequencies diffract more over obstacles, my house is in a holler and I can easily talk barefoot 20 miles, isnt groundwave wonderful. UHF, sorry, its pretty much direct wave only, murs, vhf, not with FM are you going past your line of site. Shortwave, yeah it works even better if you dont mind having a goddamn piece of water pipe on the back of your car.
2 meter and 440 ham with repeaters is cool, but with a callsign you loose any anonymity you might have had with CB, not to mention alot of uses typical of CB would be frowned upon with ham. And can you really convert every member of your hunt club, 4x4 group, etc into a technician class ham, good luck with that one.
CB will and is coming back, but not in its FCC approved form, the 4 watts they gave you is about good enough to talk direct wave or about 5 miles under average conditions.