We trained all the cats to scratch on their posts and places and to leave the funiture alone. Watch them for a few day and squirt them with a water bottle (carry it with you) when they claw anything. Yell, too. Take them to the scratch posts and put them around the place.
They also have a spray for funiture that takes the cat fun out of messing with the funiture.
Best not to declaw. : )
I'm very sorry for the loss of your cat.
But if your furniture is that expensive and you are not willing to take the time and trouble to actually train your next cat not to scratch it, I would advise against getting another one. Declawing is serious surgery; bone is removed. It involves a painful recovery period, and during that period the cat still has to walk, scratch around in its litter box, etc., regardless of the pain it feels.
Declawing can result in behavioral changes. If your next cat is declawed and doesn't like the result, and its personality is affected, you might decide to get rid of him and take him to the shelter. There he will be surrounded by other cats with claws, and no way to defend himself. The same is true if he should accidentally get outside.....he will have no defense against other animals.
You can talk to a vet or research online for many options to protect your expensive furniture. Declawing is not humane.