DaedI used the 650s with a Darkvoice 336 SE, Schiit stack (Ubers) and Creative X7 LE. The Schiit and X7 sound the same. The X7 you can amp roll though and it has tons of features. The 650s sound amazing with a tube amp though. There's the little dot 3 and darkvoice here on Massdrop. Those are the best under $250 tubes to go for.
However, usually for a first amp, you should always go with a solid slate. The Schiit Uber stack would be great, but if you have a bit more cash, the Jontenheim or however you spell it is a better bang for your buck to future proof and use with speakers.