I've heard that KT88 can sound quite good and I have yet to try them. The Super Amp 2 is so versatile it can use 6 different output tubes and also be configured in triode as well. This amp looks like Cary discontinued Rocket88 that used KT88 tubes so it makes me want to try it sometime.
http://www.audioelectronicsupply.com/cgi-bin/audioelectronicsupply.com/view_services.cgi?request=detail&dept_id=2&aisle_id=21&prod_num=superamp_mk2