although i have had coyotes responed to my e-caller,as a general rule hand(mouth)calls work better.why?? my belief is becouse e-caller tapes are to repetitive,same sound and pitch over and over.i like to use the e-caller for locating with a group howl tape then go in and set up using mouth calls.somtimes using both works for instance,have a lone coyote tape with yips and howls or a group howl tape then throw in a rabbit distress with your hand call.any call or tape will work but none of them work every time,its just the way it is.rabbit calls are the most popular and since the coyotes in your are are unworked(are you sure)they should work good.most mouth calls are either rabbit or rodent so you realy don't have alot of options in this area.just learn to use them right,practice-practice.all the call companys produce quality calls today,you just need to find ones your comfortable with and confident in.since your in georgia and freezing is not a factor,closed reed calls are easy to master but don't limit yourself to just these.use open reed and variable pitch calls.both of these give a caller a little more control and variations in pitch and sound.wood or plastic???i believe wood sounds better,it seems to resonates the sound better.do the animals and birds we work know the difference?? not hardly, so therefore use wood or plastic they both will work.