I WANT TO REPLACE MY CURRENT HEAD RIG( AN ASHLEY PREAMP WITH A 600WATT POWER AMP) FOR A LIGHTER OPTION. I AM INTERESTED IN EITHER THE PEAVEY TOUR 700 OR THE PF 500 BY AMPEG. I KNOW THAT THEY ARE COMPLETELY DIFFERENT TYPES OF AMPLIFIERS BUT I AM INTERESTED TO HEAR WHAT YOU GUYS THINK. I NEED IT...