A.B.
Since your husband is on board I say go for it. Don't worry about "starting over" baby-gear wise. I'm sure some of your friends would be happy to pass it BACK to you if you needed it. :) If not you can always just go the much cheaper route this time around - garage sales, consignment stores, etc.
Seriously, you are so lucky to have a husband who wants more than 2. There are SO many women on here, myself included, whose husbands will not even consider having more than 2, or even 1 in lots of cases. I wish I were in your position in that regard - go for it, mama!