@MaD
64-74 Bronco, Early Bronco
78-80 gen 2 Bronco, Big Bronco, full size 2 door SUV
81-87 gen 3 Bronco, smaller F-150 based with independent front suspension
84-90 BroncoII, mid-sized Ranger based SUV
88-91 gen 4 Bronco, redesigned front
92-96 gen5 Bronco, redisignd
2021 to present gen 6 Bronco, redesigned brand brought back from 96
2020-present Bronco Sport, rebadged Ford Escape
I have driven the original, ridden in gen 2's, driven gen 3's, driven BII's and the Sport (which is my brother's favorite). As mentioned from other members, your choice should be based on how much space you need and the fuel economy you desire. They are all 2 door, four seaters except gen 6 and the Sport.
In regards to cost, Shran PO pretty much nailed that as an Early will cost as much or more than a gen 6, while a gen 3/4/5 are nice they will usually cost more than a BII. That gen 2 is a BEAST with strong Ford looks.