Grrrr. Forgot to address the bumper pull vs goose neck vs 5th wheel and the truck to pull each question.
Bumper pull, obviously as it says, attaches to the bumper of the tow vehicle. Bumper is a bit of a misnomer though. Many vehicles have "receiver hitches" installed that attach directly to the frame of the vehicle. They still pull "bumper pull" trailers.
I really hope that doesn't come off as condescending as it seems...some people truly don't know some simple things like that...
Now the g-neck/5th-wheel thing. Depending where you live, they are called different things...or sometimes the same thing...but they really are two distinct different hitching methods.
A goose neck trailer uses a hitching system where the "ball" is in the back of the truck, and the hitch mechanism is located on the trailer "neck". A 5th wheel trailer has a "king-pin" on the trailer and the hitch mechanism is located in the back of the truck. Both pull pretty much the same, the 5th wheel is easier to hookup if you have depth perception issues, but is more expensive, while the goose neck is fairly inexpensive and is much more common in the horse world.
The only price difference may come from installing a new hitching system for the g-neck/5th wheel, but other than that a truck is a truck is a truck in this particular case of bumper pull vs g-neck/5th wheel.
Now if you have a van or suburban or other such vehicle, obviously you are stuck with a bumper pull regardless.