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I assume you're talking about using A123 cells. Their advantage is power density, and arguably cell life. Those little 20Ah cells can really dump out a LOT of amps, and do it quite happily. Internal cell resistance is low, and the cells don't heat up. This leads to longer life as well. I believe that leads to less voltage sag too. You do have to pay for it though.
I also thought the source for these cells had dried up since you can't buy directly from A123, and they really don't have distributors. They only seem to want to sell to OEMs. Too bad too because they are wonderful batteries.
The main problem with these cells is packaging. You have to come up with your own way to connect them. Personally, unless I got a great deal on them, I would probably just go with the CALB CA (grey) cells. They're also quite impressive, and the packaging is SO much easier to deal with. They're also cheaper.
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