You need 25,000 miles per ticket, but flight availability is always limited so you may need to be flexible as to your travel dates and times. You could each separately purchase an "Executive Privilege Pack" at $119.95 immediately giving you 7500 miles per account. You would then have 26,500 miles and your husband would have 23,500 miles. If someone can offer a suggestion as to how to transfer 1,500 miles from your account to his...problem solved.
As for myself, I would purchase one "Prestige Privilege Pack" for $75.95...then buy one ticket for myself and use the Privilege Pack $99 companion certificate for my friend/husband/wife and save the mileage in both OnePass accounts for another day. (Contact Continental first to make sure the $99 companion certificate can be used on a circle trip such as the one you are planning.)
To purchase "Privilege Packs":
Go to Continental.com >Frequent Flyer>News & Offers>Privilege Packs