Which Contacts are you looking at?
If you're looking at the Top Contacts, Continental bought these out to compete with the Marathon XRs. There has been criticism of them with people saying they aren't as good as the Top Tourings (and I think the issues about the sidewalls crankarm was referring to) - how much of it is justified I don't know.
But for what you want you really don't need to be looking at the premium-priced tyres. You should be able to get a very good quality tyre from Schwalbe, Continental, Panaracer, Vittoria etc etc for about £20. They'll last you about 5000kms (for the rear - possibly longer for the front) and do everything you want.
If you look on
Wiggle (for instance). You'll see that the Conti Sport Contact/Travel Contact, Schwalbe Marathon Kevlar, Panaracer Pasela and Vittorian Randonneur Pros all come in at fairly similar prices with pretty similar satisfaction levels. This is what you'd expect: tyres from reputable manufacturer with anti-puncture protection, kevlar bead and a similar TPI are all going to perform to a pretty similar level. I'm sure any one of them will do the job just fine.
Oh and mountainbikers have been ignoring Sheldon Brown's table for years and living to tell the tale.