Tono, for the best 'Free' piano plugin, MDA piano really doesn't sound all that good.

You would be much better off using a soundfont player and one of the free soundfonts for pianos.

A freeware soundfont player is the sfz player that now is available from Cakewalk.
http://www.project5.com/products/instruments/sfz_player/default.asp

Then you will need to download a good piano soundfont. I like to use two different piano soundfonts. I like Warren Trachtman's free soundfont which is a Steinway sampled in stereo, but at quite a distance from the piano, so it has an almost mono, non-panned sound. That soundfont is available here:

http://www.pianosounds.com/freesoundfont.htm

It is a 25 MB download.

Now, if you prefer a more panned soundfont for your piano, then the Akai Splendid soundfont is what you should download. It's something like 78 MB, and when I downloaded it, I had to download 3 or 4 different .zip files. It's available here:

http://www.soundcreationsinc.com/tech/splendid/splendid.html

With that one, you will also need the SFPACK software which is also available linked at the above site.

You will find these much more satisfactory than MDA piano. I guarantee that.

-Scott