I already have a TE and SE for PS3, and from what I read, you have to start with a 360 stick to do dual modding.

Dual modding a 360 stick would be pointless since I already have two sticks for the PS3. Not to mention the extra money and how time consuming it'd be. I barely have time to play the game let alone build a stick.

If you could dual mod from PS3 to 360, that might be ok, but I'd probably spend just as much on a 360 pcb (I'm guessing you'd use a 360 controlled, which is at least $30) and soldering equipment as I would if I could get the stick for $40.