Yes.. The Hogg Island is considered a true dwarf boa. They max out at around 5 ft and breed at around 4 ft. Im not sure where you are getting your info about them being a "big" boa because they are not. If you truly wanted a big boa you would go for a red tail. Columbian, Surinam, Guyana. Which all can get to 8 to 10 feet at least.
Hoggs are very nice boas to have and fairly easy to house due to their small size. You do know its really up to you what you get.. Not bp.net users..
If you are going to get a snake. No matter what it is. Get the one you are positive you can afford. That means everything you would need to house and care for the snake properly. If size is the only deciding factor then you shouldnt be worried about what we think.. Get what you like best.