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If you want to 'future proof' then Cat6 is better - the price increase over Cat5 is minimal nowadays. Forget Cat7.
You'd struggle to get cat5 these days - it's obsolete and replaced by cat5e. Over short cable runs, cat5e can to 1 Gbps. You could use cat6 as an alternative. I'd never even heard of cat7.
I see cat7 class F is supposed to handle 10 Gbps. But the Home Hub can't do that speed, and most devices won't either.
I got a Cat6 from Maplin, not because a wanted Cat6 but because it was flat and tucks down the side of carpets etc. Makes it very easy to route.