How heavy is the Model M using these keyboards I have:

[pingmaster]

I want to buy a model M but I can't figure out how heavy it is just using gram weightings.

I have:
Cherry MX Blue
Whatever Alps the Apple IIe uses.
Model F
Alps SKBM Gray
Alps SKCM Salmon
BTC dome with slider.

What would be a general placement compared to these keyboards?

[Myoth]

In all honestly, it's like the Model F, but not as nice. It's heavier, scratchier and not as tactile.

[fohat]

just using gram weightings

This can be deceiving. By scientific measurements Model Ms are probably a bit heavier than most of what you listed, but they don't really feel like it. Personally, I think that heavier (ie the physical mass of the entire thing) keyboards make their switches feel lighter regardless of what the science says.

[Mr.JAM]

It's not that heavier than Model F, but it's initial weighting is heavy and slightly reduced key travel make the keyboard less favorable. You can check this out https://plot.ly/~haata/68