I'd say go with a used preamp and the amps. Definitely going to give you the best fidelity, but maybe not as many of the latest features as the 3805 or 7500. Second choice, and possibly your lower cost option, would be to go with the 7500 and run the 802s with the TFM_35.
There's no reason, and no such thing as, a "matching" sub, for all intents and purposes. How big is your room?