BMI is known for producing the LiFePo4 battery packs of the highest quality.  They have recently started producing and shipping a line of very large, high current LiFePo4 packs built as drop in replacements for hybrid cars.  These packs are made in voltages up to 144V and with current ratings in bursts up to 200Amps per parallel cell!

144V 10Ah pack	3.3V 10AH Individual cells

Purchasing the individual cells instead of packs gives you the flexibility to configuring them into any physical arrangement deemed necessary.  This means however that you're also responsible for determining how to charge and balance your custom pack. 

There is a cell balancing VMS available for purchase.  Each of these circuits can manage the charging of 4 batteries.  They also have a serial output that can be used by external circuitry or a monitoring computer to turn off load when low voltage or over voltage is detected.

Right now the cost per unit on these batteries is among the highest cost of any other cells on the market, but if you are after high discharge current capacity, extremely high recharge current capacity and up to 7000 recharges, no other cells come close.