5" screen -- OK as a novelty
Brandon,
TV -- have you ever used it on the road? Reception is likely to be fair at best.
Cell phone with internet access -- again have you tried it on the road? What model and service are you envisioning using? Unless this one of the brand new so-called "3-G" models -- the fastest thru-put you are likely to get is 7 to 12Kbps. E-mail is doable near major urban areas, but web access is a huge stretch.
CB -- We have some really good links for CB information at http://www.roadtripamerica.com/dashboarding/vehicles.htm#tel
Standard (power) CB is all you need. SSB is a very useful option. Reception is not really about the power ("beefed up") but is 100% dependent on the matching of the antenna with the transceiver.
Budget: Your adventure is open-ended? How many weeks were you planning to stretch a $4000 budget? With fuel costs hovering in the $2.25 range, what % of your budget is ear-marked for fuel and vehicle maintenance?
Car Camping: Check out some of the information we have gathered at http://www.roadtripamerica.com/tips/carcamping.htm
Mark
Reality is not marketing hype
E-mail is our primary form of communication, we have nearly 8 years of on-the-road experience -- if you are expecting to use a .6 watt cell phone to enable e-mail and internet access while in rural areas -- you may be a victim of marketing hype. There are plenty of options -- the very best wireless solution may well be the WiFi connection points that are springing up. But land wireline is still the only reliable mode and easy to obtain while traveling.
3-4 weeks -- sure your budget looks sound.
Go have an adventure and then be sure to report your findings!