That spelling isn't wrong easier to go b/aid. The palm symbient is a reasonable one with the option of adding a quick release its around 140 euro. The palm extreme which is a heavy duty rescue one is 190 James Van der brooke has one. The palm axis extrame which alot of people have is also a rescue b/aid 159. then the one I have is the hs serpent I got it cheap in the alps think it goes for around 200 and there is the Aquavest which is about 220. The question with bouyancy is what do you want to do? Rodeo freestyle or river running and rescue. The symbient is a good starting bet. But for a small amount more the axis provides all you will need. Other people may have better suggestions as to what b/aid. I would ask what other equipment do you have and decide is a b/aid the next bit of kit I need.
Do you have a dry cag, wetsuit, booties, helmet, termals, paddles and a load of other small things?