ECON cruise, LR cruise...
Join Date: Apr 2002
Location: MIRSI hold - give or take...
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...and minimum MFRA remains 400 ft for all JAR/FAR-25-types. However, many manufacturers state a "general" MFRA that can be used for training purposes etc. (where no limiting obstacles exist, of course), and many pick 1000 ft AAL.
However, any given departure will have a minimum MFRA that will either be 2nd segment limited or 400 ft. as per certification - and a maximum MFRA, where the drag of the config will compromise the enroute portion of the SE climb. You rarely run into this 2nd restriction (unless you are used to alpine operations) - but it's still there, theoretically.
The 1000 ft. is just chosen to give the average student a bit more time and to allow time for any recall items to be actioned before accelerating.
The acceleration altitude is often based on NAPs and will thus often be 1500 ft or 3000 ft AAL.