@ronboco
With your budget, you should have no trouble getting a proper amp/preamp or and very good Integrated amp. BTW an integrated amp has both preamp & amp. So, if you get a tube pre, you only need an amp. But as I said before, check with the mfg on the 3 ohm dip of your speakers
another mfg to consider is Raven Audio. I believe their philosophy is high current vs instead of high wattage. They have a 45 day $ back warranty. You might get a taste of tubes and see if you like it. Just a thought Enjoy. You will have a nice system when done