You need at least a 3/4" gas line depending on how far from the meter your heater will be. Those heaters are hungry when running. As far as a softener, it all depends on if you have hard water or not. The other option is about half the price is to get a direct vent hot water tank style. It vents out with pvc as well. Just depends your preference. I personally don't care for the tankless. They require a hot water valve to be fully open for it to kick on, and there is a delay before you get hot water. Also, you have to be really careful picking one out because to get the water as hot as you may want, means they decrease the water pressure. Another issue for instance, we just replaced our kitchen faucet. No matter what you remove in that faucet, it's low flow. Our hot water tank heater is less than 10 feet away, and it takes forever to get hot water to that faucet. I can actually get hot water faster to the upstairs sink that isn't low flow and has probably over 50' of pipe the water has to run through. That issue would be even worse with a tankless.
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