I was going to take #1 on pub maps just to illustrate how rank has nothing to do with skill.  I had it too until I had to ship my desktop away.  I was also inspired to do it to mock the point exploiters that used to be in the top 10.  It was really fun finding them play together on a near empty server and cause them to RQ when they couldn't just keep planting the bomb over and over.

I like the idea of monthly ranking/all time ranking.

It lets people track their stats, as well as, allow monthly competitions.

I wouldn't worry about getting to the top10 stinK.  If you play normal amount of time you'll get up there no problem.