Looking for great violin CDs in solo.

if you are going to open this up to more than just solo violin, your universe just exploded! Now you are talking the whole world of string quartets, piano trios, cello sonatas, etc. Here are some good choices featuring excellent performances of great music recorded well:

Schiff and Pereyi-Beethoven Cello sonatas on ECM
Floristan Trio-Beethoven Piano trios on Hyperion
Kashkashian and Levin - Brahms Viola sonatas on ECM
Takacs Quartet- Beethoven Quartets on Decca
Takacs Quartet- Schubert Death and the Maiden on Hyperion

An enthusiastic second to Jburidan's recommendation of the Biber Mystery Sonatas: absolutely magical stuff.

Second Gslone's Arturo Delmoni recommendation. Lovely, sweet stuff.

A few............

Viktoria Mullova plays Mozart Concertos Nos 1,3 & 4 -Philips.
Classic Perlman- Sony
Classic Kennedy- EMI
Hilary Hahn (any)
Pamela Frank plays mozart concertos 1-5 Arte Nova
Nigel Kennedy- Tchaikovsky & Sibelius Concertos- EMI
Nigel Kennedy-Mendelsohn & Bruck Concertos EMI.
Anne Sophie Mutter.

Another nod for Hilary Hahn. Check out Anne Sophie Mutter also.