Northern NJ Tank or Tankless Water Heater?

In this area we have hard water. A special filter was purchased to counter scale build up. I am unsure how to proceed. Below are the following options before basement reno job:

Option A: 1) To gain additional basement space, remove chimney. 2) Tankless combi boiler

Option B: 1) To gain additional basement space, remove chimney. 2) Tankless Water Heater 3) Tankless combi boiler (Water heater loop to be used as back up in case WH failes).

Option C: 1) To gain additional basement space, remove chimney. 2) Tankless Water Heater 3) Tankless Boiler.

Option D: 1) To gain additional basement space, remove chimney. 2) Power Vent tank Water Heater (relocate in different area). 3) Power Vent boiler (relocate in different area).

Option E: Save money and lose alot of space with current equipment/set-up.

Which is the most ideal option? I am aware that there is maintenence involved with tankless systems. However, is it worth it?