Seeing you allready have : a Golden Gecko and a Water Dragon I'm assuming you pretty aware of humidity needs of some reptiles..
This being said, BRB can be a good choice.
The carpet is also a great snake wich is a good 2nd snake.. since you allready have a BP.
Personaly I'd wait for the Burmese (too big), I'd also wait for the Blood (can be agressive, depends of the individual you buy) need more practice with nippy snakes and as for the Red tail... again a size issue.
CB Amazon Tree Boa...
Cornsnakes / JCP / Sinaloan Milk / BRB / Veiled / ATB / WLP / Crested Geckos / Uroplatus Henkeli / Vietnamese Cave gecko / Chinese Cave gecko *What's Available*