Any suggestions on Tube Buffers?

I have an Onkyo P-308 M-508 amp/preamp combo that I'm quite pleased with but am curious to wet my feet in the world of tubes. Anyone have any experience with this? I was thinking about a Grant Fidelity M-283 tube buffer between the amp and preamp. I know it's not a full blown tube setup but maybe it will give me a little taste of the magic. I really don't want to have to take out a second mortgage. I will be driving Polk SDA-1B speakers. Any suggestions would be appreciated.