Card Recommendation for large appliance purchase

I have to buy a large appliance (about $6k). I was planning on financing it through the company but it turns out they go through a Wells Fargo home improvement card and I've been meaning to get a new daily use credit card anyway so I'm looking for other options before I open an account I won't use.

I need something that will be no interest for at least the first 12 months and that I can start using next week. I currently use my discover it card for cashback and have been happy with it, but I'd like a visa that I can use at Costco (not a dealbreaker). I don't travel much, but fly once or twice a year. I'm not sure if something like the chase sapphire preferred would be worth if I travel that little.

Current cards: Discover it, $11,500 limit Fico 830 Oldest account 13 years Chase 5/24 status 0/24 Income $75000 Average monthly spend Restaurants $200 Groceries $250 Services $100 Open to business cards? No Purpose? Cashback, open to travel Looking at Chase freedom, or capital one