Voted 1, since it's simple.
Option 2 and 3 aren't appealing in their current format. They're pretty much the exact same thing as dueling solo -- you simply belong to some "team". How can I explain this... Essentially, it wouldn't matter if the team members' duels were played at a completely different times, etc. It's just a tally of each individual's win.
If you're up for a challenge, I'd vote running teams of three, using the format of my -- currently defunct? [size=6pt](am I worse than John at running tournaments?)[/size] -- tournament, i.e., a team fencing format. The reason I would suggest said format is the same reason that team fencing uses said format. It's intense and actually /is/ a team effort -- rather than a compilation of individual efforts.
I was actually thinking of making a mod to help facilitate running such a format, but I figured for one small tournament it wouldn't be worth it -- plus I didn't/don't have a server, etc. But if it's a Marnid run ladder, who knows, could be worth it. You'd mainly want a mod for a timing function -- unconditionally dueling to 45 points could take a while depending on the opponents.