To get one of the better lower cost supplies with very stable VDC, good response and no frills, I presume you'll want a linear supply.
A used Agilent E3610A on eBay is typically under $200. This provides all the output protection needed, you can parallel or series multiple such supplies for more V or A, superb support [ IIRC this model has been around for decades] and WYSIWYG on the voltmeter and ammeter. For other conveniences, look at the various options in that model line.
On lower cost linear supplies like Mastech however, my feeling is first you want good stable V or A, CC, CV and short circuit protection as a minimum. Overvoltage is definitely a plus, but if the meter provides stable CV or CC, its the minimum in the absence of overvoltage protection. In old style linear supplies, very little can go wrong unless you bump the dials and change the dialed output.
The Mastechs voltmeter can be off < 10% on mine, but what the PSUs meters actually show you I feel is secondary to stable output, its prudent to monitor the circuits true V or A through a real time voltmeter and ammeter right at the PCBs power jacks. While having great meters on the PSU is a plus, and accuracy always helps, there is always some drop on the leads which worsens at high current, so thus the need for sensing terminals and extra costs for the PSU, and this is convenience over what is really demanded of a good PSU.
Me thinks its better to have multiple quality DMM, dedicating 2 of them to monitoring V and A during bench testing than rely on the PSU of the meters, which will be hard pressed to match the accuracy of a good DMM and will always be slightly off proportionate to load.
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