Plugin with social commenting features?

hello,

Does anyone knows a wordpress plugin for comments with these requirements:

– comments using wordpress system and social comments as well: user has a comment box where he can comment using socila account or his wordpress site local account;

– only one comment box for both types refered in the first requirement;

– when commenting using social account, user can post to his social network (with a check close to the button);

– every comments are listed in the same hierarchy (nested as normal);

– it can be a payed plugin BUT the payment cant be by month. just one time payment.

– also, ALL the coments must be kept im my local site. I dont want my comments elsewhere.

The only closer to this I was able to find was this plugin: Social.
However, it has some bugs and it seems none is fixing it.

All the others are payed monthly (I guess just one), or uses different comment boxes (one for wordpress local comments and one more comment box by each social network!) which is extremely ugly and not user frindly.

thank you,

fwu