As mentioned a cellpro 10x will see you beyond a 450 size heli as are a lot cheaper. You can charge 2 packs at a time without parallel charging. If you look on fastlad or midland helicopters website or give them a call you could get all the gear in one hit and know it will all work together if this would make it less daunting for you. Once your setup with your first charger you Will soon know a bit more. As for batteries look at giantcod or electric wingman, they are UK based and the loongmax or gens ace packs are great value with good performance. you will need a soldering iron to change the battery connectors, i got mine from maplins where you can pick up heat shrink and other little bits you might need.
Hope this helps
Sent from my GT-I9100 using Tapatalk
Hope this helps
Sent from my GT-I9100 using Tapatalk
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