need help choose captcha extension

-- HikaShop version -- : 2
-- Joomla version -- : 2
-- PHP version -- : 5
-- Error-message(debug-mod must be tuned on) -- : none

Hi
Joomla has by default a plugin directory of name captcha that appear in joomla 25 ( i hope i not write wrong things : come from my study of differences beetween joomla version since all information are store in files/directories ) .
So if we speak about joomla extension : all extensions ( so hikashop) should support thrid extension that claim to be compatible with joomla ( default joomla extension) . I am in the step of search a captcha extension that fullfill this requirement ( compatibility) .
I think quality has a price so i don't mind pay for quality and support ( support i don't need if quality prevent incompatibilities and documentation and forum are available for free ) . Does HKS team could give some clue ? I don't want to use many captcha plug in or captcha that work for only specific extension . Use specific extension mean extension that are not compatible with joomla default extension !! .

recaptcha seem the "best ?" but why explicit list the all the name of compatible extension name ( HKS ...) since compatible with joomla is the only word we need since Hikashop is joomla compatible .
www.hikashop.com/support/documentation/i...-with-recaptcha.html

I begin to think that jed miss to give information about the level of reviewers ( commercial , hobby could help even best is refer to a portfolio website ) .So many reviews content can be bad from beginner and excellent from developpers ..... .So when there in in jed too many good reviews; focus on bad . And when there is too bad reviews focus on good one !!

regard's