In my opinion it depends on the niche. If you want to sell something, then #2 is good, since I don't think wikipedia sells anything by affiliate links, etc. if people want to buy something, they will go straight to your site, ignoring wikipedia. If your site is an informational kind of site, then it might worth it to try beat wikipedia, it depends on how profitable your keyword is... You can compare the monthly searches for that keyword with your monthly organic traffic. If your traffic is much lower, then maybe wiki really hyjacks your traffic. If not, then I'd be satisfied with my second place.