...gopher snake.
I know they are not as popular and they get a little longer(but not thicker) then a large corn does but they are more atractive as first time snakes to me then even corns(which are one of the best). I've dealt with only wild caught gophers but I assume the captive bred ones are even better on each point then WC.
Positives
- tame, just like corns gophers tame to the point of biting being excedingly rare(I've never had one actually land a bite on me)
- very hardy, I never even bothered to use temperature or humidity controls. Room temp and room humid are fine with a water dish.
- Eat like a pig, just like almost every corn I've had gophers will eat everything and anything you throw them(at least if it's a rodent).
- very active and friendly, just like corns they seem to enjoy handling and in my experience gophers have even more personality then corns. Even had one of mine free roaming the house as a kid and it was always back in it's cage on feeding day lol.
Negatives
- can cost more, the average price is a little more excluding high end morphs in corns.
- local laws, depending on where you live they may be a native species and thus be protected. This is the case in California and here you need a permit to keep them unless it is a albino morph because 'fish and game' does not consider albino's a naturally occuring form lol.
- higher adult food costs, because they get longer then corns your rodent bills might be slightly higher then with a corn but not that much.
- personal prefference, some people just do not find the appearance/pattern of gopher snakes appealing, to each his own 
- less profitable, if planning on breeding and selling gophers are less profitable as they lay fewer eggs and don't double clutch with the regularity of corns(at least to my knowledge). Also while they sell for more individually it is harder to find buyers quickly as they are not generally as popular as corn's are.
Both Corn snakes and Gopher snakes in my opinion make excellent first time snakes. I just lean a little towards gophers, if you like their look, because in most of the areas that corns excell gophers excell as well or better.
Hope was helpfull.
Sean.