I know what you mean about wondering if you have the stamina to put yourselves out there again. We ultimately had a great experience with our birthfamily but it was emotionally draining, nonetheless to go through all the ups and downs of matching, the birth, the relinquishment and then the goodbye (even though we will continue to have contact). My DH and I were musing about it all while still in the birthfamily's town and wondering how we could ever find the strength to do it again. But at this point, we say we will in another year or two. We are pretty old (44) so we can't wait too long. If we were younger, we would go for three.
I think that if you are feeling a pull in that direction, you should explore it. If at any point, it gets too hard you can pull out, right? Just don't go with an agency with a huge up front fee so you don't risk too much financially. My DH sent me this quote from Mark Twain when we first met and I had a million reasons for not exploring a relationship with him (mostly because it was long distance and I had the perfect dream job and home in the perfect town):Twenty years from now you will be more disappointed by the things you didn't do than by the ones you did. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover.
OK, maybe that is too cheesy (I am feeling rather sentimental and everything looks rosy to me these days!). To be sure, you and DH have to do some serious soul searching to come to the decision that is best for you and your family. But the way I think about it is, if we decided to take a chance to adopt again and succeeded, I can't imagine we would regret it. But if I wanted to but didn't from fear then I might really wonder for the rest of my life. Maybe as you take the first steps you can see if it continues to feel right.