alright fellas ive had my rig for just about a year now, warwick profet IV 400w @ 4 and 410 cab. beautiful, couldnt ask any more of it. i bought the head for $450 AUD on ebay used, minor scratches but perfect everywhere else. im pretty sure i got it for a steal. now i see the 5.1 series is around for $800 in stores, but i also saw another profet IV go for $900. the 5.1 has 100w more, but i have 10band eq and MOSFET power so whats with the big differences in price? $900 for a 400w and 500w for $800?