What 7-String guitar should i get?

I am looking at getting a 7 string guitar but i dont know what to get. I have went into locale guitar shops but there arent any in. I play metal and nu metal and i am a huge korn fan and i want to play some of there songs but a lot of them cant be played on 6 string. so could someone give me advice on what guitar to get and where i can i buy that guitar. thanks