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I just went through the same thing, went with engineered, more stable, wide planks available. How stable is your humidity in the house?

Was looking at finishing on site, doing it myself and after speaking with a supplier realized it was going to be way too much added work and time, can only sand a couple hundred square feet in a day if you want really good finish, then add three or four coats of 2 part urethane top coat, cost and time add up. With good quality engineered the top layer above the groove is almost the same thickness as solid T&G about 3/16, so up to 4 refinishes. You can also get unfinished engineered product, if you want to stain and finish on site. I can look for my quote on materials and rentals for finishing to give you an idea on price if you want.

One thing to look for is average length of planks in the box, the longest I found were up to 84" in engineered in solid you can order much longer, wide solid should be full glue down, ended up with 7" wide maple and I did a full glue down, glue down adds some cost and harder to work with but is a really nice floor, you can do nail down with partial glue out of a tube. The proper glue turns into soft rubber.

One advantage to finish on site is no micro bevel on edges, and if going solid the long random lengths that are available.