Forget the Prima Luna, overated and over reviewed. I would go for the Jolida 707a with stock OEM 5058 tubes or the Jolida 801a with stock OEM KT88's if you need more power. These amps are just amazing! Best bang for the buck in the tube world. Plus their integrated so you can always move up to a pre amp in the future. All you have to do is listen to them, for the most part reviews are full of crap! As far as biasing goes it's easy, you only need to do it for the power tubes anyway, you can pick up a digital volt meter at ratshack for about $15.00, it takes few minutes to do. The bias trim pots are on the top of all the new Jolida amps. Have fun!