Tastes in performances vary.
Many people (including me) consider the Fleisher/Szell performances of the five Beethoven and two Brahms (1st in particular) piano concerti to be outstanding. You can get them in this box set
http://smile.amazon.com/Fleisher-plays-Beethoven-Brahms-Concerto/dp/B006XOBFN8/ref=sr_1_6?s=music&ie=UTF8&qid=1438622413&sr=1-6
For the Grieg and Schumann Concerti, Fleisher/Szell is my first choice. Sound quality is much better in the Sony Great Performances (2004 remaster) CD. There is an older Great performances CD with a yellow newsprint cover that has
I'm recommending several Fleisher/Szell recordings because their collaboration in the 50s and 60s produced wonderful performances.
For Rach 2 and the Rhapsody on a theme of Pananini, I like Rubinstein/Reiner, Wang/Abbado and Solti/Solti and Boult.
The Mozart Piano Concerti from 14 through 27 are all great music. No. 9 too. I'd start with No. 20 and Rudolf Serkin/Szell in the Masterworks Expanded Edition with no. 19 would be my first choice. There are lots of fine performances for 9 and 14-27.
These recommendations are based on quality of performance. Their sound quality is adequate for me to enjoy the performances without giving a thought to sound quality.