Well Mark (marik) I for one think your mics sound wonderful! Keep up the good work.
Thank you Tim for your nice words!
To the OP,
If you have a fairly dead room then my first choice would be whether SD true omnies (maybe even with Jecklin disk), or ribbon Blumlein setup. Those will probably give you the most natural piano sound in your conditions. I always try to stay away from cardioids on piano and use them only in some special cases (like for example in especially bad room, recording live in smaller halls to separate the audience noises, or as a spot mic).
Best, M
