If you wanna go for natural beauty, Suriname RTB's look amazing. Their saddling is amazing as well as their deep red markings that can go up 1/3 of their body. You can get them for like $150, maybe even cheaper. Guyanas look great as well and I believe they don't get quite as big, but double check that. These are BCC.
I believe most of the designer morphs are BCI or BCI/BCC hybrids. The average RTB you will see is more than likely a BCI. They do not get quite as big as most of the BCC, however they can still get quite large. The morphs obviously are more expensive than the norms.
I think the general consensus is that most BCC top out around 10-12 and BCI top out around 8-10. There are always exceptions however, and typically it is the females that get to those sizes.
Have you looked into superdwarf reticulated pythons? They max out well under 10 feet and are much thinner bodied than boas if size is a concern for you. They have very distinct patterns and some interesting morphs. Keep in mind you would probably only want a superdwarf, as dwarves and regulars top out at 14-20+ feet.
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