Lipo doesn't show performance gains from charging at higher charging rates like NiMh does. The only thing you do by charging lipo at higher charge rates is reduce charging time. Some say cycle life is reduced, but testing and experieince indicates otherwise. Your lipos have to be rated by the manufacturer for charging at higher than 1C charge rates to safely charge at higher than 1C charge rates.

As far as chargers and power supplies go, you need to be more specific - how many of what size (mah and cell count) lipos you want to charge at once and at what charging C rate. That sets the output power the charger needs and also determines the size of the power supply.

The parallel charging boards available today are set up to charge 6 lipos (same cell count - this is requirement of parallel charging, and lipos should be same discharge rating and age) that are 2S and 5000mah at 1C requires 252watts from charger. This would also require a charger that has a max charge rate of 30amps which is going to be the limiting factor in charging multiple high capacity lipos. A 2C charge on 6 5000mah 2S lipos in parallel would require a charger with a 60amp max charge rate and that's beyond anything available that's I'm aware of.

Depending on your lipos manufacturer's ratings for charging, safe charge rates could be 5C or higher. I parallel charge two 4S 5000mah lipos at 3C (30amps) since that's the max charge rate of my charger. Lipos are rated to 5C charging, but beyond my charger's max charge rate.