If your S5e's are anything close to my 1/2e's then you're going to need a bit more power based on the size of your listening room and your listening position. I was using a 50 watt tube amp that did a nice job with my speakers, but it wasn't until I went over the 100 watt threshold that I could really appreciate them. I own a Music Reference RM-9 100 watt (tested close to 120 watts on Roger Modjeski's bench when I took it over to have it upgraded to a MkII) amp and TRL D-225 225 watt solid state amp and both work nicely with my speakers. The Music Reference is below your price range used and worth checking out.