Arnage or older Continental - aftermarket warranty?

It's hard to ignore the spectcular value an Arnage or Continental offers these days.

But that's before the running cost.

Is there any aftermarket warranty around that one could take out of peace of mind?

Any advice here is well received.

Hanwell offers a two year warrantly on their cars, but their prices seem almost double of a car that you would buy without them involved?