I use the eneloops myself, as they suit my style of flash usage, which is somewhat infrequent. The low discharge there helps a lot, as it means I don't have to worry about remembering to top up the batteries before using them. Higher capacity ones may be more suited if you're likely to have heavy or frequent use.
On a Nissin Di622 I think I was getting around 200 shots per set of eneloops, but that was diffuse/reflected/macro so I think the flash power was generally quite high.
_________________Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.