yeah, you're welcome

eccpm is basically you have 3 servos that control the swash movement and the pitch of the blades with computer mixing in the Tx (electronic collective cyclic pitch mixing. The other option is mccpm as some people call it (which isn't correct because there is no mixing involved) has a servo for the fore and aft cyclic, and the left and right cyclic, and then one for the pitch of the blades. There aren't alot of the mechanical setups around anymore, but there are still a few.

hiller is a type of head, and so is bell hiller. The bell hiller is more responsive because it has direct links to the flybar. If you need more info on that I've got some pics somewhere that show the difference.

brushless is a good way to go because it uses less power, is more powerful, and doesn't wear out. There are some things to keep in mind though, especially when it comes to buying a brushless esc. I'll let someone else fill in here because I don't know all that much.

I forgoet how mini and mico's are classified, but it's usually like under 400g stock weight is a micro, and over that is a mini. Micro's are harder to fly because they are more responsive and less stable, and mini's are more expensive but alot more stable, but you'll probably end up somewhere in that range.

That is one of the great appeals to the RTF packages. Not such a steep learning curve. If you decide you want to go with a TRex, check out helifreak.com they have alot of good build videos.

I personally think that would be a good package because you get the dx6 and a complete setup for like $500 bucks, but I dunno that much about TRex's, so maybe someone else could give some better advice.