Whichever you decide to buy..Depends on how small-big you want,size of enclosure you have(or buy-build).Any of the Morelia sub-species can be good.(except greens) but also Aspidities are great snakes too,Woma or BHP are terrific snakes to own,but are very food orientated..Sometimes anything that moves they consider as food..I gather you havent had ur licence for long,so a Chondro would be out of the question to start with..Also depends on how much ur willing to spend.Generally most of the common pythons go for $100 upwards to $4500 or even more for a albino Olive..which i doubt you want..So it all comes down to what you want-what you wanna pay...