Alright currently I have an Epiphone Les Paul Custom running through a Peavey Classic 30 amp. I am looking to get a new guitar with the help of my parents as a x-mas gift.

I play lots of Nirvana and Metallica, and i am going for a guitar with both sounds.

Would an ESP Explorer be to heavey sounding and would a Fender Mustang be to light sounding?

Any reccomendations?

Fender Mustang will give you the Nirvana tone but will be too thin for Metallica stuff.

The ESP explorer will be perfect for Metallica but too fat for Nirvana.

I agree with Jelifish, get a new amp. The Epi LP is a decent enough guitar, the amp is letting you down.

My toys:
Gibson Les Paul Special w/ humbuckers
Gibson Flying V
Ibanez RG550 (1992)
Epiphone Wildkat
Marshall AVT150H
Marshall 1960A reissue
Fender Pro185