Thanks for your attention to my question, I hope that the 18F4680 does not have the same problem of the 18F4620, I was searched about this in microchip.com but I don't find anything, I will post in http://www.midibox.org/forum/index.php?topic=4838.0 about this doubt. I'm a little distrusted about the shipping, it could spoil or something. The advantage is that on SmashTV's Store they can send it me programmed with the bootstrap loader, and the cost are the relatively the same: buy on SmashTV's Store, including shipping, etc; or buy the 18F4680 in my country (Chile, South America) ... well, I will think deeply in this before do something, I will be glad if you post any other advice, thanks again to you raphael and Jidis.