...and need your advise!

I've just moved to a new house and would like to buy a new, real audio system.
I'm primarily interested in music (just stereo), but might buy a big-screen TV soon and then would need home theater setup.

I don't have an exact number for my budget... Something around $1500-$2000 for the whole setup would be nice. Actually, I can spend more, but given that I'm a casual listener, that would be an overkill for me.

Music I listen to: rock, alternative, elecronic. Less often: blues, guitar, piano. Rarely: opera, organ, chamber music.

Now, about the room: it is 19'x20', 8.5' high. Just in case if it matters for acoustics:
The room is rectangular; about 1/3 of the room wall area is covered by windows (one wall is completely made of glass, and 2 glass sections on the other wall. The ceiling is made from wood, the floor is currently carpeted, but we plan to change it to hardwood floor.

The room is currently empty, we haven't got any furniture yet.

I guess, I need floorstanding speakers, amplifier and some sort of CD (+SACD?) player. As a next step, I'd need components for home theater (I don't know yet what's needed - never had one)

I was considering these speakers:
Axiom m60 or m80
Paradigm Studio 60 or 80
Magneplanar 1.6

Don't know which amplifier to get. I friend of mine recommended to get a used Sansui AU-717 on eBay. But I guess, I need to choose the speakers first and then decode on the amplifier.

By the way, I play piano and have the Yamaha P-250 electronic piano. Which has great sound, but the built-in speakers are inadequate. It would be nice to connect the Yamaha to the amplifier/big speakers. Or, do I need a separate amplifier/speaker for this?

I'd appreciate your comments and recommendations. Thanks!