Any of the San Francisco Symphony's Mahler cycle (on their own label), take your pick, though I particularly like the 4th and 6th Symphony recordings. Also, the Harmonia Mundi releases have been uniformly very good to excellent--the de Falla Tri-Cornered Hat/Nights in the Gardens of Spain disc has been one I have returned to a lot, though the piccolo in the former can come across as shrill as it does in real life. And Julia Fleischer's recordings for Pentatone, especially the Mozart concerti, are excellent.