I own three bicycles. I want to get them all to a usable state for me.
Bike #1: [Edit: I got it fixed

]
Bike #2 is a Dahon Boardwalk S1. While I was riding it, I got hit by a car. The front wheel was ruined [Edit: And the fork is actually pretty bent--perhaps it could be bent back into shape, since it's steel] I wonder if it's worth getting a new wheel and trying it out.
Bike #3 is an $80 single-speed beach cruiser with coaster brake and no front brake. I want to remove the coaster brake and add a front and rear brake to the handlebars, because when I got hit by the car on my Dahon it ruined my left leg, and so it's very hard to operate the coaster brake now. [Edit: This one isn't actually broken or anything, though]
Are these ideas reasonable, or am I going to put myself through too much work and expense to make them worthwhile? Should I just replace them? I don't want to spend more trying to fix these bikes than it would cost to just buy new ones.
Any advice is very appreciated.