Hi,
Here are some other features decent bench supplies have, you may or may not need them all...
1. Dual output (2 channels), dual adjustment set, common ground.
2. Dual output but with two isolated outputs.
3. Current meter, voltage meter, both channels or switched between channels, analog or digital.
4. "Fine" and "Coarse" adjustments for both current limit and voltage. That's four pots per channel.
5. Multiple outputs, some fixed like 5v, 12v, 15v, etc.
6. Mandatory: short circuit protection.
7. Optional: variable AC output.