I have a condo with two rear outlet, floor-mounted toilets. One is a newer (2 yrs) Gerber with the Sloan pressure assist, located off a bedroom I hate how loud it is, especially because it's located above a living area. The second is an old, 1970s Kohler with a huge, 3 gallon tank, located in a very small powder room. It flushes great, but it's huge and in a very small bathroom. I'm concerned about switching them both to the combination of rear outlet, 1.2 gallon and gravity only. Two questions: If I replace the Gerber with a regular gravity Gerber or ICERA (both have >1000 MaP ratings), will I regret it? I don't like the noise of the Sloan system, but I don't want to be plunging this thing all the time. The old Kohler flushes great, but we'd like something smaller and more contemporary. Is it a mistake to replace it with a newer Gerber or Icera? Thanks for your help and advice.