I agree with others who have suggested a gift card. A sewing machine is a very personal purchase.
That being said, I LOVE my Baby Lock machines. There are models for all types of sewing, and I just got an e-mail from them that they will have Black Friday specials, as well as special financing available. I got a Baby Lock serger last year with 2 year no interest financing, which made it affordable for me.
Also, kudos to you! You're a very thoughtful husband.