In common terms, the pictures are as follows.....
Mexican Fire Leg
Brazilian Black
Chaco Golden Knee
Rosehair
Mexican RedKnee
Of all tarantulas, the Brazilian Black is the friendliest (calmest), Rosehairs are tempermental. Most people think they are the calmest, but really, they are just the most popular because they are the cheapest and easiest to find. Out of 3 rosehairs that we have, only the one pictured is somewhat calm.
I wouldn't say that they have personalities so much, more like behaviours, certain species behave differently than others. The meanest one we have is an Indian Ornamental, they are fast and agressive. Otherwise, tarantulas do not like to be handled, they have no awarenss of their owners, so are best left alone, but they key to handling a tarantula without getting bitten is to pretend you are the dirt they are walking on.
They can be expensive to purchase unless one goes through a breeder/importer, as most of ours arrived, and we got them as spiderlings. The Brazilian Black costs about $50 through a breeder for a 1" spiderling, probably abut $150-200 for a full grown adult. A female lives up to 25 years, whereas a male will live up to 3-7 years (they cannot moult as an adult, as it will kill them). Upkeep is simple, they need to eat once a week/2 weeks, and can live in a decent sized kritter keeper. Habitats only need a thorough cleaning once every 6 months, with a light cleanup with tweezers after they have eaten.