What length and what model should I go with? What are you getting?
This is a difficult question.
As a general rule you can say: the shorter the cables the better.
But. There is always a but ...
I'm going to order some 60" probes. Reason:
My meters are sitting on my right side, a bit far away from the DUT so I need a bit more cable length.
And most things what I want to measure with the long cables are voltages between -50V ... +50V, sometimes
resistors, testing diodes, LEDs, continuity testing etc.
All this stuff is not very susceptible to distortion, so the length of the cables is not problem.
Most people I know are using the right angle banana connectors, because they find them convenient.
I personally do like more the straight ones, but this is a personal preference.
If you want to hear a recommendation for you, here it is:
I assume you are a beginner and will start with the common stuff.
I this case I would suggest these for your 8050A:
the 8043S Kit with the 60" cables and right angle connectors.
Reason: it comes with some nice handy test clips and the length of the cables should be sufficient for most workbench configurations.
Edit: some typo