Lots o money...
If you want your big investment on packs to last you need the correct charging/cell balancing equipment. Right now, the tech is mucho expensive and I don't see the price coming down for a long, long time.
hacker has a new gearbox out
C50's ran at about $320, you'll need 4
$1280 for motors
1 hacker master 90 acro will run you $420 you'll need 4 again
$1620 in esc
I'm not sure if you can buy an off the shelf gearbox assembly but I bet they aren't cheap. Right now you have a choice between duraflight lipos or TP lipos and theyll set you anywhere for $4,000 up to $9,000 or more I believe.
Ka ching
http://www.hackerbrushless.com/