Help Choosing a Keyboard (music)

I am being pestered to buy a harmonium. by my mother.. She wants to teach her grand child, all of four years. ;-D

Without going into good or bad of starting at that age, I feel that she (the grandmother) does deserve one.

But I feel that it may be better to buy an electronic one, rather than the acoustic ones, which require "pumping". (Hope I got the term right).

Though purpose is teaching a kid, mother is fairly good player of harmonium, so I am not looking at entry level ones. She is currently using a triple reed one (that is the kind used by professionals).

Some search on the net shows that reasonable looking ones are available for around 5K, but I am clueless when it comes to parsing the specifications. Some models from Casio are priced at 2/3K, but they look like toys.

The questions:-
a. How do I know if a particular model has harmonium or not?
b. Will I need to buy speakers / amplifiers separately?
c. What about powersupply?

Any specific models suggested?

I am very flexible on budget – but not anything over 10K.

Thanks in advance.