Hi,
Budget explorers:-
Hauler ( with engineered fsd, minimum mass for everything else) good jump range, no armament, no passengers
T6 - with enhanced red and thrusters, virtually defenceless, but good jump range, cargo and passenger capability.
Dolphin - with engineered fsd, enhanced thrusters (grade 4), can outrun almost everything, carry passengers/cargo. Almost impossible to overheat. (I've taken one to Colonia from Shinrata).
all cheaper than the Asp X.
Once you get past the Asp X threshold, Krait Phantom - Anaconda has the longest range and largest cargo/passenger capacity. It's also the most ponderous...
if you're out in the Galaxy, you're very unlikely to encounter other commanders, apart from the known attractions.