For only $100, I'd take the U1733C, no second thoughts required. You don't have a country selected in your profile so I can't tell where you are, but if you don't want it and it's in the US with reasonable shipping cost, I'll buy it right now.
If you don't need to measure LCR components and you're concerned about accidentally blowing up a combo meter like the DE5000 or U1733C, then get a dedicated and protected ESR meter. If you do need an LCR meter, too, you can get one of each and have peace of mind, but it really depends on your personal preference.
Regarding in-circuit cap testing, regardless what test voltages are used, you can be misled if the component is left in-circuit. So, you do need to be aware of the circuit layout and all components that may affect behavior. For best results, you should at least disconnect one leg of an in-circuit component to test it.