Test Equipment
The spelling is "Tektronix" and is considered to be the ultimate brand in oscilloscopes. Don't let anyone try to tell you that a digital scope is the only way to go. The older analog scopes are just as useful today as they were in 1960 and you can get top-quality, lab-grade plug-in analog scopes or high-end service scopes for far less than you'd pay for a "bottom feeder" digital scope. And I definitely caution against buying a new scope, especially one made in Asia. Asian scopes, especially inexpensive ones from China and Korea rarely come with decent manuals, usually have no schematics or calibration information and have a horrible service structure if any. If you have the CRT go out on a Hipsung brand scope while it's under warranty, you'll probably be sucking air with regards to ever getting it fixed. If you're lucky, the deal will refund your money or swap you out with a new scope ... but I doubt it. Don't worry about finding parts for that used Tektronix 7704A or 465. There were so many of them made (like VW Beetles) that you can always find "hanger queens" to rob for parts.
Dual trace is not an option. It's necessary, not only for viewing phase shift, but for looking at any timing relationships, especially in digital circuits where you seem to be putting some of your emphasis. A bandwidth that's at least four times higher than the fastest digital frequency you'll be viewing should be plenty. You can get 100MHz, 200MHz and higher bandwidths on ebay for a song.
Low end function generators will likely suffice for most of your needs. The ability to have variable symmetry is a plus for the PWM work as one poster mentioned. And if you work with audio filters, a function generator with built-in sweep would be great. But you may be able to buy two low-cost generators for less than one with sweep. You can always use the triangle output of one to drive the VCF of an other to provide sweep.
If you're doing precision, low-distortion audio work, a function generator will be useful only for general troubleshooting, for its sine wave output will have distortion in the 2-3% range or more. The best Tektronix function generators (e.g., the FG502 or FG504) may get as low as 0.3%, but if you're using a distortion analyzer, you absolutely must have a low distortion sine wave to work with. This means an audio oscillator and not a function generator. The old Hewlett-Packard 200CD isn't bad as are newer versions of the "200" series.
You may find that the emphasis on variable voltage power supplies, especially ones that will go all the way down to zero volts, to be unwarranted. If you do digital work, you'll usually just use a fixed 5v, 3.3v or 3.0 v supply; if doing analog work, you'll usually just use a fixed ±12v or some such supply. The variable supplies are mostly for learning situations where you have an experiment where you plot diode voltage drop against forward current and such things. Now, current limiting can be very handy, especially if you have a habit if installing semiconductors backward!
Dean