If you do decide on an icharger, I highly recommend getting it from progressive. They will warranty it, if ever nessesary, and you won't need to deal with a third party. Their customer support is great and I recommend a chat with them. They will be able to tell you what you need and not try to up sell you.
As far as power supplies for it, look on ebay for server power supplies. I typed in 24v rc power supply, also 12v rc power supply. I am using a 24V 1500 watt server power supply. By going this route I saved about $350