Agreed with Maggie - a vet told me that cat claws are used in their walking/running/jumping balancing etc, and it's the equivalent of cutting off a human's toes. Bone, tendons and more are amputated. And if they ever go outside by accident, they are in trouble.
This, this, thisity, thisthis!
Last year, my colleague decided to get rid of her 9 year old de-clawed cat and rather than let her take the cat to the pound (where she surely would have been euthanized), I took her in.
She is majorly clumsy and is limited in where she can go and what she can do. She hates having her paws touched, and will gently snap at you if you rub them. Worst of all, she has problems with the litter box, presumably because her paws are tender, or she developed incorrectly due to the lack of claws during the time she was learning how to potty. She doesn't bury her leavings, is very timid about going in the box, and often just pees on anything soft that is on the floor (clothes, bathmat, towels, etc). Also, she constantly puts her paws in her water-dish, which I think is her attempt to 'clean' her paws, but could just be her being neurotic.
It is a really painful procedure for cats, and not at all like clipping nails -- despite what some people claim.
I know other people suggested ways to deter scratching, but one I can add is getting 'Feliway' (I think that is the name?) spray or diffusers. It releases a smell imperceptible to humans, but simulates the pheromones that calm cats down. Plug a diffuser in near the couch, and perhaps -- in combination with making sure he/she has lots of things that he/she can claw safely -- it will deter the cat from becoming claw-y while near the couch.
That being said, I've had two cats that were totally 'dog' cats. Loved to be held, constantly wanted to lay on me and be petted, followed me around, enjoyed playing and chasing balls -- one cat even would fetch the ball and bring it back to me to throw again and again.
Try looking into rescues, as they usually have cats in foster situations. You e-mail the rescuer place and explain your living situation (for example, how much time you are away from the house) along with the fact that you want an affectionate/dog-like cat, and they will usually try and find one that meets your needs.
Best of luck, mate!