I don' t think you are nuts at all. I am in the same place with these two QBs. Had I used Tebow last week, I'd have been 8-1 instead of 7-2 (also should have trusted in What'chu Talking Bout Willis even with a surgically repaired hand).
Brady has been off his game lately with inaccurate passes, he does not look comfortable for long periods of time. The GIants had him rattled until the very end of the game and the Jets are a better D.
Tebow is always interesting, he is becoming more like a RB good for 60+yds and a TD that can also throw for 125+ yards provided he throws 30 times. The KC defense isn't all that great (save that insane game against OAK, which I don't think is indicative of their week-to-week play).
I haven't decided 100% to go with Brady, I need a win this week and can't have the same Brady that played the past three-four weeks show up. I need the Brady from the beginning of the season.
Lineup (starters in Bold)
QB - RG3, Romo
RB - McCoy, MJD,AP, MJD
WR - Nelson, Austin, T.Smith, Wallace
TE - Graham, Bennett
DST - Lions
K - Tucker