If you gave me your price range, I could help you better... but how's this for an amp:
http://www.musiciansfriend.com/srs7/...se_pid/482615/
and this for a guitar:
http://www.musiciansfriend.com/srs7/...se_pid/516639/
and don't forget about effects! you'll probably need a distortion pedal, and a wah pedal, and I don't know what else.
if the amp isn't really what you were looking for, then look around at other things. but what guitar would be better for replicating metallica sounds then a kirk hammett signature guitar? (it has your 24 frets and a floyd rose)
Life is like a box of chocolates, it\'s good but it ends quick, especially if you\'re fat! :)