beginner configuration

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Hello

j am new and novice in digital.
J have just discovered pianoteq and the results seems to me good

J have just baught a new sound card : presonus audiobox, and test with a yamaha P85 (from the music club) and a pair of small monitor  Magma with 5 inch woofer and a tube amplifier .

The result is not as great compare to what j have listen on the site.

What kind of monitor, do you advice for piano restitution, much bigger woofer in order to have more bass.

In the other way, j have to buy a keyboard and j am a bit lost.

With low prices this my list

- Korg sp 170 : 500
- Yamaha P85 : 525
- Thomlann SP5500 : 400
- Fatar studiologic sl 990 pro  : 400

As j have difficulties to undertand english j am often lost with technical words and some problems with the velocity of some keyboards (fatar)

Could you tell me wich one to buy
J need this system because my son ( 2 years learning) can not play with the acoustical piano, in the night.

Thanks a lot and sorry for my poor english.