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I would recommend a SB-910 with SD-9 battery pack. Or if you don't want to spend on a SB-910, do a SB-900 with a SD-9 battery pack (else you might find that the recycle time might really suck if you're flashing a lot). That or just get a QFlash or CheetahLight if you're planning to only use a camera-mounted speedlight for all future shoots. If planning to expand later to multiple flashes, go with the 910.
I've used the SB-700/800/900/910... The 910/900 are a bit heavier than the previous models, even the 800.