Hi
We are currently having the same disscussion - Freya is now licking the glass, a rather novel way of getting out the house i feel.
We followed the link to 'purrfect fence' that i found on here somewhere. The idea is sound but just a bit out of our price range. So i went hunting on the tinternet. The Deer fencing i have found at £125 for 100 m (PF gives 30m) yes it is half the height but you still get more fence. It is the poles which are giving us problems at the moment, (the likes of b & q have poles but they are only 1.8 m ) but i emailed a company on the weekend who make iron and steel structures (eg rose tunnels) for gardens, their normal poles standing at 2m are about £4.75. So just waiting for them to get back to me.
I need a enclosure which can be easilly moved ( i am in the RAF and move every 3-4 years) and as the garden backs onto others it can't be an eyesore, so this way seems the best for us.
I shall let you know - but it is another option for you.