All the answers provided are good! I strongly agree with with the agent that mentioned that, BUYER is the one who really set the tone in this market. And you are obviously a well informed BUYER.
Your plan is good, just ask your agent to present the offer, and to provide all the documentation and rational you all took into consideration to determine this price.
After 6 months in the market, and if the seller really want to sell this property, they will be open to entertain your offer. Be ready for a counter offer in this case... Remember the inventory out there is big, you can keep looking if this offer doesn't work out.
Best of luck to you and your husband! and remember to enjoy this important moment.
Life is Beautiful!