I'm using A123 cells on my motorbike right now. 23S and2P, so about 76V/40Ah.
They are quite impressive, I made quite a lot of test so far:
-I get about 75-80km of range at relatively aggressive speeds
-Voltage sag is about 2.5V while drawing 210Amps from the battery (a bit more than 5C)
-They really don't heat much
-The cells stay very much in balance
-Capacity seems to be almost unaffected by current draw, you can ride it hard and it doesn't seem like you lose much range at all.
I had other lithium batteries in the past and so far this one seems perfect to me.
I only wish is was a bit more power dense, but 80km is already enough range for me right now, and I have enough space to add another one of those battery packs so I could easily do 160km if I ever feel the need. Well anyways, you can go for it, it will work great on whatever motorbike you're planning.
You can check my build thread if you want, it might give you some ideas
Good luck with your build!