If you think we'll get Campbell for £1 million your off your head. He's out of contract next year but Harry will still milk all the money he can get, I'd expect he'd cost us £3/4 million minimum.
If reports are true that Campbell wants to move up here then harry will know about it. Like you say he has a year left on his contract, which means they can either cash in now or lose him for nowt next year. They will probably sign Bramble on a free, therefore that money can go elsewhere.
Either way there are better options than senderos. Distin, Tel Ben Haim and Hypia to name a few.