I think with your experience, you would do fine with any of the rats,kings or even a well established yearling milk.
Here are my choices, not in any order, as they are all great and hard to say which are the best!!
Rat snakes
1. Black rat snake - I like these the best of all the rats. They are the largest and are dog tame if raised properly. Even mean adults tame down with regular handling. Although there are always going to be the exception to the rule!! These babies come in a variety of morphs and locales and natural colors! Awesome snakes, and never turn down a meal, natures trash compactors!!
Here is a pic of my Bullitt county locale black rat. He has a little more yellow than the average, but this is how they are here in KY.

Here is a pic of my Saline county locale MO black rat. Notice how black these guys are?? Just like some of the eastern board black rats.

Here is a pic of an albino produced by Dwight Good. Dwight has some killer rat snakes, and just about all of mine have came from him!

Now here is a pic of an everglades rat, also produced by Dwight Good.

Here is a greenish rat, also Dwigh Good stock. These are a natural intergrade occuring where the black rat and the yellow rats ranges overlap.

Here is a yellow rat, also Dwight Good stock.

And a picture of a KY locale corn snake. This is a normal corn.

Now on to the kings:
Here is my female california king. She is Het albino and probably why she is so bright yellow.

For comparison, here is my male, he is het nothing. Just a plain old coastal phase. Not even a pretty one, but what he lacks in colors, he makes up for in size. He was pushing 5' last fall. I havent measured him in a while, and he is still growing.

Here is a KY locale black king snake. These are IMHO, an underrated snake. These snakes are very hardy and are very, very docile.

And here is a KY locale prairie king. Another of my favorites...

How about a Florida king...these come in a multitude of morphs and make great pets as well!!

Here is a desert king. Not too many morphs of these guys, but a beautiful snake nontheless...

There are a few other kings I dont have that would make a great pet. The Eastern, Brooks, and Speckled are on my list to add and are some nice snakes.
Some of the milks would be great as well. The Honduran, black milk, and even an eastern yearling that is well started would make great snakes.
Hope this helps, and if your not careful, you will have lots of snakes in no time!! They are very, very, very addictive!!! LOL
Brian
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RATS
1.0 Corn snake "Warpath" (KY locale)
1.0 Black rat snake "Havok" (KY locale)
1.1 Black rat snakes "Reaper and Mystique" (MO locale)
1.0 Albino Black rat snake "Malakai" (Dwight Good stock)
1.0 Everglades rat snake "Deadpool" (Dwight Good stock)
0.1 Greenish rat snake "Rogue" (Dwight Good stock)
1.0 Yellow rat snake "Wolverine" (Dwight Good stock)
1.0 Grey rat snake "Punisher" (White oak phase)(Dwight Good stock)
RACERS
1.0 Eastern Yellow Belly racer "Nightcrawler" (MO locale)
KINGS
1.1 California king snake "Bandit and Moonstar" (Coastal phase)
1.0 Prairie king snake "Bishop" (KY locale)
0.1 Black king snake "Domino" (KY locale)
1.0 Desert Kingsnake "Gambit"
0.1 Florida Kingsnake
MILKS
0.0.1 Eastern Milk snake "Cable" (KY locale)
0.0.1 Eastern/Red milk intergrade "Omega Red" (KY locale)
BULLS/GOPHERS/PINES
0.1 Sonoran Gopher
Good luck and Happy Herping
Brian