which tube?

i interested in getting into tubes. but not sure which tube amp to buy.

i listen to a lot of rock n roll, blues, jazz, some metal etc.

i already have a naim and musical fidelity setup for loud rock music.

what i am currently looking for is a system to hear at low or moderate volumes at night. what i want to listen at night is soft rock, blues, jazz etc. like nick drake's 'eight leaves left', simon and garfunkel, cooking with the miles davis quintet, thelonius monk's 'brilliant corners', Coltrane's 'lush life', buddy guy's 'a man and the blues' etc.

so i am not really looking for 'slam' or 'grunt'. and i want it to be more versatile than only playing 'a girl and a guitar' kind of music. and i don't particularly prefer it to sound like solid state - like kt88 is supposed to? i would rather prefer it to convey the magic of tubes.

so which tube based amp to go for - 300b, el84, kt88, el34 etc?

single ended or push and pull?

appreciate the insights.