I have two great opportunities right now... I can get a Carvin F1200 Power amp and find a decent preamp in a rackbag... OR A great deal on an Epifani PS 600. OR a great deal on an IAmp800 that I can try out and save on shipping. Which would be best for punch, reliability, lightweight, and price? And if the Power/Pre route, please suggest a preamp that would go for 200-300 or so used.