Some of these are great suggestions,....
blood, bismark ringed, spotted, childrens, savu, d'alberts pythons.
Pits, as stated above.
Taiwan, Vietnamese, russian rats
Rainbow boas
but I am currently caring for a cb and raised white-lip (d'alberts) and have dealt with a few wild-caughts and I would have to disagree about them being suitable for beginners.
They are very high strung, do NOT like to be handled, and will bite you if you give them a chance.
They are gorgeous, but not a snake for beginners.
A really gorgeous snake that is often overlooked and REALLY easy to care for is the Baird's Ratsnake. Some of the captive bloodlines are really spectacular.
Here's a list comparing and ranking some beginner species, some of which are common, and some of which are rare. The ones with the low rankings are good choices, the ones on the bottom with bad rankings are only put there for comparison (I would put white-lips down there as well!) -

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Chris Harrison
San Antonio, Texas