i need an amp that i can play live with thats not too expensive. like say between $400-$800. im thinking of getting a crate, i like their sound. does anybody have any suggestions for particular models that have a good metal sound and around 100 watts or so. combos or stacks. i have a line 6 50watt amp now but its shitty now and the sound cuts off sometimes and its not always loud enough. thanks.