Welcome! Most of us here get both personal and business cards. A business is anything you do that earns extra money above your regular employment such as selling on ebay/Facebook Marketplace, yard sales, etc. You apply as a sole proprietor using your ss# instead of an incorporated biz tax id. Most newbies are hesitant when getting their first biz card (including me 2 yrs ago), but once you do it you realize that it opens up a lot more opportunities for earning pts.
I mention biz cards first to you because the Chase Ink Preferred would be perfect for your upcoming spend. It is currently offering 100,000 UR for $8K spend, which is normally a $15K spend. If you are hesitant about the biz card, I would recommend the AmEx personal platinum. The AmEx sign up bonuses (SUB) often vary depending on whether you use a support link, incognito browser etc. I just pulled 100K for $8,000 spsend just through regular Google. That's not a bad offer, but some of us have received 125K or even 150K pts.
If neither of the above cards interests you, maybe try for the C1 Venture X for a 75K SUB. That one has been hard for some of us to get. No rhyme or reason why they are stingy with approvals for that one. You might be more likely to get an approval since you have the Quicksilver.
Another piece of advice for beginners: most of us here are willing to pay annual fees (like the big AmEx Plat fee) because we make sure to maximize the benefits on the card (and/or by factoring it into the overall cost of "playing" this game). I encourage you to join our Reddit group where you can find support links from members here. We try to help each other out when we can by using the support link of someone who has been helpful. However, you and your husband should support each other after you get a card.
Third big piece of advice: do not add each other as authorized users on each other's cards. That will take up one of your valuable 5/24 slots. Chase only allows an individual to have 5 personal cards in 24 months. That is not just Chase cards, but any personal credit cards.