Thanks CrossRoads, great input. I do want to get the right one and not add components.
I found these guys local in Miami to avoid shipping.. They have a list here of logic mosfets:
http://www.nteinc.com/Web_pgs/LL_MOSFET.html
I am trying to figure out which one... My longest strand of lights is 16' @ 36w and 3Amps..I think 2980 or 2981 would be ok..(?)
Thanks Crossroads, this has been a big help.