my bands is getting ready to hit the road hard and i want to pick up a backup head with my tax return. i'm not wanting to spend more then 2-300. i'm thinking between an ashdown mag 300, an ampeg b2r or a gk 800rb or 700rb or one of those behringers that look like ashdowns bx300? i'm not against buying used and i've seen all of these heads go cheap on the bay. i'm looking for durability and decent tone i can use a sans amp to make any of these sound close to my svt setup but was just wondering any thoughts on reliabilty and power. thanks.