Inexpensive Tube Amps

I have a pair of Mid Monos.... they are great amps.   I love them.  I bought a mint pair that was about a year and a half old for $1050, but honestly they are worth their asking price.    Mike Sanders support is top notch, one of the bsst in the biz.

The Quicksilver amps that I have owned have never let me down and sound great. Very affordable as well as made in North America. They have just released an integrated. 

PrimaLuna, their Dialogue Premium HP amplifier is to die for. Absolutely stunning sound and dynamic and built better than amps costing 3 times as much. Truly the best amp my Magnepans have ever played with. Glorious sound.

Cheers 

In the process of downsizing, I just sold my pair of Quicksilvers.  Lovely sound, the kind which all but a handful of Chinese product cannot approach.  Apart from the need for avoiding brittle (JJ) 5AR4 rectifiers, never a hiccup.  The dead simple (Dynaco) circuit, and the use of readily available parts provide both sonic and long term ownership benefits.  Apart from a transformer failure, an owner who understands tube amps (or any technician) will be able to keep it on the road indefinitely.

DEFINITELY recommended

The OP's listed options implies a budget of <$300 but those particular models are not suitable for the target speakers. If you insist on that budget, you're better off looking for a hybrid model with 25-35wpc power and return it if you don't like it. The main problem with those moderately cheap priced amplifiers is their quality is hit or miss, crackling tubes, scratchy volume control, etc. They may actually sound decent if you happen to get a "good" one...