It really depends on your priorities, base preference, etc.
My choices would be as follows, let see what people think
1. IBERIA
2. AIR EUROPA
3. IBERWORLD
4. SPANAIR
5. AIR PLUS
6. FUTURA
7. PANAIR (TNT)
8. BINTER
9. AIR NOSTRUM
10. VUELING
11. LTE
12. AIR MADRID