I want to buy a different classical Cd!!!?

Chopin isn't "out of the ordinary" or "lesser known," but you didn't mention him. You said you like piano music, so Chopin would be a great choice if you don't already have a lot of his music. He wrote hundreds of pieces, mostly for piano. Specifically, I would recommend the album "Arthur Rubinstein: The Chopin Collection." It doesn't include ALL of Chopin's piano pieces, but it does include a great deal of them and Rubinstein was a fantastic pianist. The only con is that it can be pretty expensive, but that's to be expected for a collection that includes 11 CDs. You could probably find it used on Amazon for quite a bit cheaper than retail.