I used a Bel Canto S300 with my Spendor S8es and thought it an excellent match. The S8e can be bass heavy and I found the amp to provide good control. They make an integrated version of the amp (the S300i, I believe) so you might want to check that out.
Other thoughts: NuForce also makes an integrated that would probably be a good match. The Spendor dealer where I purchased my speakers preferred Plinius amps, so I can testify that was also a good match.
Other thoughts: NuForce also makes an integrated that would probably be a good match. The Spendor dealer where I purchased my speakers preferred Plinius amps, so I can testify that was also a good match.