Sure the 50 gallon will suffice for today with the current tenants in place but they aren't going to be here forever. 

In the mean time, books (that you mentioned on another post) will have to suffice!    

If you can't handle it yourself, perhaps bringing along more horsepower would suffice.

Nothing less than absolutely professional will suffice.

That should take care of all of my question, except you will probably need to add drain pipes (cheap corrugated pipe 2-4ft long will suffice) or downspout splashes (little more expensive) as the gutter guys don't typically do that. 

I parged the walls but it didn't eliminate the leaking, but being a low profile root cellar type basement with antiquated french drainage it suffices for now.Thankfully the front area (30x15) of the basement was built as a 'bomb shelter' so the solid poured cement walls & ceiling do not leak or bow & definitely supports the rest of the building.

If you are dealing with a motivated seller and they need to be out of their home (note) because of various reasons - they are in need of a quick turnaround, a traditional method that takes 6 months to a year to sell will not suffice.

Suffice to say, the only way that I feel like my life can actually continue in any sort of measurable capacity is if I get out of this house and mortgage.

For my own understanding, if the building is owner-occupied (which in my case, it will be, I forgot to mention that in the first post), a normal homeowners policy would suffice (via @Frank Chin). 

I've always heard $1000 was pretty standard and given the circumstance I'd say that should suffice!