If you've got one w/o the CF spar, then it's better to stay with a lighter battery pack.
Servos: Hitec HS-81 or equivalent (get the metal geared, if crash prone or planning combat)
ESC: Any 20A ESC, the GWS ICS-400 or similar
Battery: 8x600 Sanyo NiCds, 8x1100 HECELL NiMHs, 8x1700 NiMHs, I have also heard of folks trying the 2S2P 1570 LiPolys.
LHS,
www.aircraft-world.com, www.aeromicro.com, www.edogfight.com, post for used stuff in the appropriate for sale/wanted forum.