I have a C30 I got from a fellow AK'er. I wouldn't recommend one though because they are normally way over priced since they were only made for two years and therefore "collectible". I guess no one would buy them because they didn't have a remote. The classic pre amp with a 2505 is the C26. C28's have issues with the volume control. The Mac pre amp is such an upgrade! First I got a MC2200 and I liked it, then I had it recapped and it sounded a little louder, maybe 3dB. But when I got a Mac pre I was BLOWN AWAY! When I had it recapped it was even better!
I listen to a lot of classic rock, Zeppelin, Allmans, Dead, Jimi, etc., lots of '70s progressive rock too, Yes, Rush, King Crimson, Genesis, etc. I like it loud too, 85-90dB.