Vintage Klipsch speakers together with SET amplification is a match made in heaven IMO. You are starting out at the top from my perspective. I think which SET amp you decide on (which tube type) may be determined by listening to the different types which is unfortunately not always easy to do since so few dealers seem to have a wide selection. Your musical tastes and expectations would be a good indicator of which direction to take, as well as your budget. A good middle ground is the 300B tube offering a bit more of a low end then the flea-powered options that emphasize the midrange at the expense of low end. Your Belle Klipsch can be driven with a match so power is not really an issue. As far as which amps to look at, I think George Wright's amps make a good pairing with Klipsch. See his offerings here
. I also might look at Cary's SET offerings as they are plentiful and come up used at decent prices as well as being highly regarded. I have one of their preamps which is built like a tank and works well with my SET amps. Not sure about books, but there is plenty of info online by doing a bit of searching. A good starting place would be the SET ward over at AudioAsylum which is here
. Also you may find further resources on the single driver speaker site here
Hope that is of some help.
Good luck...I think you will be pleased with that combination if you do it right.