Hi, I currently have what I consider to be a really nice set-up. I've got a Aguilar DB680 pre-amp and an Aguilar DB728 power amp. Unfortunately, I think the cost of power tube replacement is becoming more bothersome as of late, and I'm considering moving to a solid-state power amp. I've looked into the QSC Audio PLX and the Stewart World series. Both of these seem pretty adequate. However, after selling my DB728, I'll still have money left over to consider possibly more expensive options (not that I want to unnecessarily). Are the QSC Audio or the Stewart Worlds about "as good as it gets" for the solid state world of power-amps? Is there something a little more tasty? Is there anything that compares well to the DB728? I really appreciate people's feedback.