I really suggest looking at the animal shelter or a rescue, whether you want a baby or an adult. In my life so far I have had the immense joy of being "mom" to 10 wonderful bunnies. 4 were adults when I got them and 6 were babies (all of the adults were from the animal shelter/rescue situations and so were 2 of the babies). It is fun watching babies grow up, but it's also wonderful to get an adult. Whether or not they were babies when I got them has had no influence on how well I bonded with them. I love all my bunnies, but my undeniable favorite is one of my boys who came from the shelter as an adult. It is true that babies can be messier and can go through a bratty stage (though not all of them do- the 6 week old babies we adopted last summer were litter trained from the get go and never stopped being sweethearts), but I've not really encountered any problems with my little ones. My best suggestion is to pick a rabbit based on their personality, rather than age, gender, or breed. At least in my area, Mini Rexes are actually the most common breed that pops up at the shelter. The two little ones I mentioned earlier are Mini Rexes and their mama who we adopted in January is of course one as well. Another thing to keep in mind is that big bunnies are great, too. A lot of people want small rabbits because they think they'll be easier to handle (or something), but little bunnies are often (not always!) higher strung than the big guys. My first bunny as a child was a Netherland Dwarf and I loved him to death, but he was definitely the most keyed up rabbit I've had and honestly a lot of owners probably would have been turned off by his personality.
Good luck! You'll get lots of great advice here on the forum