Well... I did start out with cornsnakes, and they are easy feeders and breeders. In my opinion though, they generally lack a little bit to the other ratsnakes in terms of personalities. My leucistic texas rat has yet to show her true colors, but she comes out at night and is a very curious animal, while most of the corns I've had were content to hide 24 hours a day until fed.
My one anery corn is an exception. She is the most curious, bipolar snake I've ever seen. Unfortunately I often walk away from her cage with some bites, but sometimes she's fine. She really does have a terrific personality. I do consider her an exception to my rule, because I've worked with 100's (or even 1000's) of corn snakes with a local breeder. Some show a lot of personality, other really don't, so its a hit or miss.
As said in the other post, there are an astounding amount of color variations with them. I saw a new one practically every time I went over to the breeders house to work with them, from motleys to phantoms (which he was first to breed). You can shout out two "snake colors" and normally find a corn that fits your specification.
The jungle carpet pythons I've had have shown the most personality, and are terrific pets that are incredibly curious and fun to watch. Kingsnakes that I've worked with show a fair amount of personality and are also very fun. My friend on one occasion had a childrens (or a spotted, I can't remember) and it was also a very interesting specimen also.
Boas vary from species to species, but I've really only done much with rosy boas, kenyan sand boas, and occasionally a dumerils. Rosy boas are sometimes great, docile pets, but other times they can be very troublesome. Sand boas are the most docile snakes I've ever handled, and it's pretty fun to have to fish them out of the sand in front of a scared to death relative. Dumerils were kinda picky, and the ones my friend had didn't make it.
I personally like the pythons the best of the snakes I've owned so far. However, my lizard and my former turtle display(ed) far more personality than any of the snakes I've had.
Just pick a species you like and go for it. I encourage you to stay in the realm of low humidity, medium cage temperature for the first snake, and once you get the hang of it to move up to something more advanced. But with research you can literally own any non-venomous snake successfully as long as you know what your getting into.
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Current Collection:
0.1 Antherystic elaphe guttata guttata - Corn Snake
1.0 Elaphe vulpina gloydi - Eastern Fox Snake
0.1 Leucistic elaphe obsoleta linheimeri - Texas Ratsnake
1.1 Morelia spilota cheyni - Jungle Carpet Python
0.1 Tiliqua scincoides intermedia - Northern Blue Tongue Skink