I felt the same way. I have several different species of snakes and love them all as much as my 11 corns. I'll go down my list:
My 1st recommendation is PITUOPHIS (pine snakes, bull snakes, gopher snakes). I have a pair of N.Pines that are awesome! Only problem is that they will grow large and will need larger enclosures. These N.American colubrids are fascinating...Check out the forum on this site for pics posted...There are a lot of different color morphs out there. I plan to expand with some bull snakes when I move in another year and have more room. While there are not many breeders of Pituophis out there, the ones around seem to be quality.
Second, I tend to favor pythons more than boas and have ball pythons (which are ok), Green Tree Pythons (that don't really move from their perch), and Ringed Pythons which are my favorite since they have as much personality as my corns. They are not too large (compared to burms)...just a little bigger than ball pythons. Some people complain that their temperament is bad, but mine are easy to handle and are always out of their hide boxes looking for attention.
As far as boas, I have Brazilian Rainbow boas (which are pretty but seldom out from their hide box and a solomon island ground boa (candoia) which are way too hard to keep alive and feeding.
Otherwise, I would maybe think about kings...I picked up a pair of grey banded kings recently but am having trouble getting one to start eating (they are known-problem feeders). Most of the other king snake species are similar in care to corns though.
I may get other rat snake species when I have more room. Check out ALL the forums and research research research!!!
Post some pics once you decide to make the leap.
-----