If you think you might be starting to play a long game consider getting
a "mixed signal" 'scope that can capture, trigger on, and decode a set
of digital signals as well as providing analog measurements, and
consider I2C/SPI/UART/USART decoding essential, if only as an option
(i.e. don't drop the money for something that can't eventually decode
these dead common serial modes unless you know you're only dipping a toe
in). I went a long time with my Rigol without an "unavoidable use case"
for logic signals involved with debugging new hardware, but when those
use cases finally came around it was nice to have the capability and not
be looking around for another piece of equipment, most especially when
you need to see what's going on with several signals at once. In about
seven years I think I've topped out with two analog and seven or eight
digital signals with one set of gadgets. The integration of digital and
analog is a real plus, for instance where you need to jump around
between figuring out a noise issue vs something basically wrong with a
serial line like with I2C. And of course you can correlate analog such
as with A/D converters with digital signals feeding them to sort out issues.
-Pete
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