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C4 & C5 might be an overkill
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Not at all. That pair is roughly equivalent in performance to a traditional U/V 7-51 combo antenna around 8-10 feet in length (7.5 dBi on VHF, 12 dBi on UHF).
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Winegard 7698P on the roof pointed at 90 degrees magnetic might be a better option.
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The 7698 is king of the hill when it comes to 7-51 combo antennas. It's 14' long and is very, very directional. Pointing it due east won't get much in the way of reception since not much is in that direction.
Selecting a combo versus separates is a lot like picking between a two story house and a ranch house. Each can be 2000 square feet, but one takes twice the amount of ground. With separates, you can also customize reception for each band should it be needed.
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A rotor will only work, if your tuner allows you to ADD channels.
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That's absolutely correct. Same thing if using a two-antenna system with an A-B switch. The set manufacturers that use tuners that force a rescan should be avoided by rotor users. Unfortunately, you really don't know what you have until you get the set home and start exploring the menus.
Your tuner-less set is going to need an external tuner of some kind. For the Sony Wega, you'll need to check to see if has the ATSC/8VSB digital tuner. If you bought it after early 2007, it should be so equipped.