Stride would be great, particularly Teddy Wilson style.

For pop/ acoustic, something in the style of Kenny White would be really good.
He has played on a lot of modern-folk, singer-songwriter projects and always brings something special. You can find a list of his credits here:
http://www.kennywhite.net/pk_credits.htm

This might be a bit off base for your current RT recording, but some country piano Real Tracks would be a good addition. Something in the style of Matt Rollins.
You could throw a dart any any country record made in the late 80's through the early 2000's and chances are he's playing on it. Better yet, get Matt Rollins to record some country piano RTs. That would be fantastic.

Good luck,

John