Hi folks. I´m thinking about getting a Gretsch Bo Diddley guitar. Sounds easy. But: there´s a G5810 Electromatic and a G6138 Pro-Line model. Or not? The 6138 can´t be found on the Gretsch website. Precious little info are to be found on the net or the tube so I ask here instead where the experience is in abundance! Is the 6138 a discontinued model? Was it, or is it, basically the same model but upgraded with gold plating and G tailpiece and whatnot? And if I do get a 5810, can a G tailpiece be added later? Enlighten me please. My main problem is not to purchase either guitar, it is to find one to try out -I have no idea what they feel like to play.