Why bother with a flight pack?
My question is, do you already have the 7 channel computer TX? If not then your're buying the wrong flight pack. If you do, then go ahead and buy the 4-channel package, but make absolutely sure you're getting the same servos and RX as shown in the flight pack. One digit off in the model no. of an RX and you could be looking at as much as a $50 drop in value. Same applies to the servos.
Be thorough in the examination of the components you're about to plop down your hard earned cash for.
If you're still in doubt after that, give us the specs on what you want and we'll check it out for you.
Good Luck!!