One other brand to seriously consider is for a great line of vintage solid state gear from the 1970s is Marantz. Their early and mid 1970s receivers and integrated amplifiers are some of the best consumer audio ever manufactured.
I own a Marantz 2235B receiver that I purchased off of eBay for less than $100. It had a few of the display lamps burnt out when I got it, I had it checked over and the bulbs replaced (these are readily available) and the FM IF stage realigned, all for less than $225 including shipping plus the minor repairs. This receiver is conservatively rated at 35 WPC, but probably puts out more like 50 watts. I have found that the Marantz receiver can easily drive my Sennheiser HD600 headphones, note that these headphones are notorious for being hard to match with much of today's gear.
A Marantz hallmark for many of the mid and upper range models of amps and receivers of this period was to build in three separate tone controls: Bass, Mid, and Treble. This allows the bass control to be down around 50 Hz where it belongs, the Midrange control at about 1000 Hz, and the Treble control at 15,000 Hz. Some of the higher-end models actually offered selectable turnover frequencies for each tone control band. If you listen to recordings with less than ideal mastering, or just like to tinker with the tone settings, the Marantz units offer alot of flexibility.
Like the vintage Fisher components, these Marantz amps and receivers are built to last. A Marantz receiver is not something you'd want to move frequently, many weigh at least 30 if not 40 lbs. On the plus side, their largish footprint provides alot of ventilation and these units never even get warm in normal use, so they will last a very long time.
Check out this site for a good idea of the different Marantz amps, receivers, and tuners that were manufactured.http://www.classic-audio.com/
If the tube bug has bitten you, I would follow Tuberoller's advice and look into acquiring a vintage Fisher receiver. While some of the tubes used by these receivers are currently out of production and can only be purchased as new old stock (NOS), or stripped off of other gear, tubes generally do last a long time and their life can be maximized by judiciously lowering the bias voltage applied to them from the power supply, and also adding a small fan to the back of the receiver cabinet to increase airflow.
Actually, I would recommend that you look into getting both a vintage tube and solid state rig, as each has a unique sound and also features and conveniences. When I am at the computer and want to listen to some music, my Marantz receiver is right there offering first rate sound through either headphones or speakers. But when I want to experience audio magic, and indulge in some of the finest of headphone listening available, nothing can take the place of my Fisher 400 receiver driving the HD600s.
I've already socked away a second Fisher 400 receiver to ensure a ready supply of parts and tubes until I am too old, or deaf, to care. So I don't mind telling the readers here that right now the vintage Fisher model 400, 500, (possibly 600?)and 800 all-tube receivers are one of the best bargains in tube audio ever available.
Compared to the prices for the vintage Marantz or McIntosh tube amps and preamps, and tuners, which run into thousands of dollars per component, the Fisher tube gear can be picked up for a fraction of the cost and actually offers what some believe to be superior sound. Especially with headphones, the relatively low wattage (typically 30 watts/channel or less at 8 ohms) of most of the vintage tube amplifiers and receivers are not a limiting factor in the sound you hear.
Good luck with your search for some vintage gear of your own!