Re: Which method would yeild the greatest net result?
 

Could you explain your motivation for betting on 2 (or 3)? I don't see any reason for these bets as there is no EV+, just risk.
The correct betting strategy seems to be a combination of 1 and 4 depending on your risk aversion.

Re: Which method would yeild the greatest net result?
 

As I said in my first post, it's not entirely clear what the OP meant.

If he means paying $1 for a 50-50 chance at winning $2, then yes, that's risk with no +EV.

I and several other responders decided to set that interpretation aside and answer based on the assumption that bet#2 meant losing $1 half the time and winning $2 half the time.

bet#3 is a bad idea under either interpretation. bet#4 is affected only slightly by which interpretation you use.