I'm setting up a new HT soon with three KL-650THX speakers up front. I'm currently powering my existing speakers with Tag Mclaren 5x100 multichannel amp. I feel this may not be ideal for the 650's and was wondering what people recommend. An audiophile friend recommends tubes and am inclined to try them. If I decide to try tubes what is a cost effective tube power amp that works well with the Ultra II's? Thanks