Hi, i have a rega rp3 hooked up to a marantz pm 5004 with dali zensor 1 speakers, it's ok but i feel the amp is a bit lacklustre, i want something with a bit more punch and grip, sometimes the marantz just seems to lose control especially in the bass department, i listen to mainly classic rock and acoustic music so detail is important, another area where i feel the marantz is lacking, i have a sort of short list of ca azur 651a, nad 355bee and a rotel ra 10, i would like a bit of power on tap which the rotel is a bit short of but am willing to overlook that as i know of it's sound quality, what are your thought's. budget up to £500.