this might help to get you the list of amps....
Review: Portable amp roundup! 37 portable amps reviewed and compared - Head-Fi: Covering Headphones, Earphones and Portable Audio
the above link has rated amps in this order
1. Triad Audio Lisa III
2. Qables iQube
2. Headamp Pico
2. Larocco Audio Pocket Reference II mk 2 (availability unknown - PLEASE read entire review)
2. Meier Audio 2MOVE (and the older MOVE)
3. RSA SR71
3. RSA The Predator
4. RSA The Hornet “Mâ€
5. Xenos 1HA-EPC (discontinued)
6. RSA Tomahawk
6. Meier Audio XXS / Headsix
7. Xin Reference
7. Meier Audio Porta Corda III (discontinued)
7. Xin SuperMicro IV (current version auditioned 1/22/08)
8. Headamp AE-2
9. Go-Vibe 7
9. Mini3
10. Leckerton Audio UHA-3
11. Portaphile V2^2
12. mSeed Spirit (discontinued)
12. Mini-Box E
13. Storm B4
14. iBasso P-1 (discontinued)
15. Visely HEA- 1
16. Microshar uAmp107
16. Practical Devices XM4
17. C&C XO
17. iBasso T2
18. Go-Vibe 6 (discontinued)
19. Xtra X-1 Pro
20. Xenos 0HA-REP (discontinued)
20. iBasso T1 (discontinued)
21. Xtra X-1 (discontinued)
22. C&C Box V2
23. Storm B3
24. Little Dot Micro+ (discontinued)
corda xxs has favorable review(but is the same as headsix which is cheaper)....around the same price is minibox e+(maybe better than minibox e)...favourable again
