If you're happy at your old job then I wouldn't jump for that unless you know people who have worked at your new job and are very happy about the work environment there. Reason being the risk of jumping from a good environment to a bad one.

I also would be very careful about asking old job to match the salary. However I would bring it up at my next review that another company solicited you and offered a $11K jump and while you turned down the job because you're happy there you'd like to see your salary adjusted to that market level.