+1 to piperjack's input. Sometimes its not another distortion pedal or boost that we need, its simple things like proper EQ-ing of the sound. However, if you still think you require a pedal to cut thru the mix, i recommend the Wampler Super Plextortion from SV. Amazing sound, this thing can do anything from blues to near-screamo metal. Its got am edge to its tone, meaning it'll be able to cut thru the mix in the scenario you mentioned. Sure it may be pricey but i think it'll be money well spent.