The "best" collection of Phil Och's work may be:

Farewells & Fantasies: The Phil Ochs Collection [BOX SET]
Rhino R2 73518 (1997)
ASIN: B00000347F

Disc: 1         
1. What's That I Hear         
2. The Bells         
3. Morning         
4. Bound For Glory         
5. The Highwayman         
6. Power And The Glory         
7. That's What I Want To Hear         
8. Links On A Chain         
9. Love Me, I'm A Liberal         
10. Too Many Martyrs         
11. In The Heat Of The Summer         
12. Here's To The State Of Mississippi         
13. I'm Going To Say It Now         
14. One More Parade         
15. Draft Dodger Rag         
16. I Ain't Marching Anymore         
17. We Seek No Wider War         
18. Ringing Of Revolution         
19. When I'm Gone         
20. Song Of My Returning         
21. There But For Fortune         
Disc: 2         
1. The War Is Over         
2. I Ain't Marching Anymore         
3. White Boots Marching In A Yellow Land         
4. Is There Anybody Here?         
5. Santo Domingo         
6. Song Of A Soldier         
7. Cops Of The World         
8. Bracero         
9. Canons Of Christianity         
10. I Kill Therefore I Am         
11. The Confession         
12. William Butler Yeats Visits Lincoln Park And ...         
13. A Toast To Those Who Are Gone         
14. Changes         
15. The Doll House         
16. When In Rome         
Disc: 3         
1. Pretty Smart On My Part         
2. The World Began In Eden And Ended In Los Angeles         
3. Tape From California         
4. Chords Of Fame         
5. Gas Station Women         
6. Miranda         
7. Outside Of A Small Circle Of Friends         
8. Cross My Heart         
9. Flower Lady         
10. The Scorpion Departs But Never Returns         
11. Pleasures Of The Harbor         
12. Jim Dean Of Indiana         
13. Rehearsals For Retirement         
14. Doesn't Lenny Live Here Anymore         
15. No More Songs         
16. Crucifixion         

Tho currently out of print, used copies turn up pretty frequrntly.

A search of amazon.com turns up several dozen Ochs CD's still currently available.