Need help with integrated amp selection

With that speaker I would suggest you not use tubes due to its impedance characteristics. I think an 70 watt Pathos integrated hybrid (maybe above the price range) might be worth considering. You don't need a lot of watts to drive these speakers, but you do need some current to drive and control the bass.

I do think the Pathos will be out of your price range. Accordingly, I would look for a used Sim Audio integrated. I think there i-1 is 50 watts or so, and that should be enough voltage drive for your speakers.

There are several used Musical Fidelity integrated amps in your price range. They have a reputation for tubelike sound. Check Stereophile archives for reviews. Sim is good too.