Well.... it depends on whether you want an SRV or no.
If you don't want an SRV and are trying to maximize jump range, get a 2A power plant (just a little engineering to boost the power will make this more bearable), a 1A power distributor (if you're going exploring, you don't need boost), a 6A FSD, 5D thrusters, a 7A Fuel Scoop (expensive, but worth it on long hauls), D-rank life support and sensors, an ADS and DSS, a 4D shield generator to get through the mail slot without worry, and some AFMUs both to absorb heat damage and to fix damage. Turn the AFMUs off unless you're using them; turn the shield generator off when you're out in the black unless you're landing. A 2A power plant, as is, doesn't have quite enough to power the fuel scoop and the shields at the same time, which is why even level 1 engineering on a 2A power plant would be useful.
If, on the other hand, you do want an SRV, then I'd recommend the 2G hangar (unless you want a spare, in which case go with the 4G), and bumping the powerplant up to a 3A.
Some other views on how to kit an Anaconda for long-range jumping can be found
here. My thoughts differ slightly from theirs, but the philosophy is the same - to keep it light, and only use what you need in terms of power and weight.