Since you are planning on getting an independent test done, I'll wait to provide sizing recommendations. You can check your state's website for certified labs. You want to know: TDS, pH, hardness, iron (ferrous and ferric), manganese, sulfates, nitrates, bacteria, TOC, particulates (preferably with size distribution). There may be other tests that your state recommends based on where you live.

So far, the only usable number you have is hardness. TDS is "acceptable" -- means nothing. Pretty much any TDS is acceptable, but the higher it is, the more salt is required and a larger softener may be necessary. pH balanced - balanced at what number - 7.0? It could be balanced at 5.0 or 10.0.

Sediment filter: Big Blue style is great. For one person, a single 4" diameter x 10" long filter will be fine, unless you have excessive particulates in your well water. What size is your current filter housing and what type of filter cartridge are you using? How often do you have to change the cartridge?

As to softener size, the price difference between a 1.0 cubic ft softener and 0.75 (the smallest you should go for any house) is negligible. Provided you are removing particulates upstream from the softener, we can make the slightly larger softener quite efficient for your. Let's get the analysis first though.

Prices: Drain and power costs look reasonable. Softener price seems a bit high. Do you have other local water treatment companies you can speak to?