Machine Learning for IDS: which dataset?

Hi there,
I am interested in applying machine learning algorithms in detecting network 
intrusions. I read many papers and realized that the KDD-99 is the most 
well-known dataset used in the field. However, this dataset is provided by MIT 
in 1999, and obviously, its pretty old. As we all know, the defensive 
technologies are fast, and also the hacking techniques. Clearly, the KDD-99 
dataset would not provide the true representation of a network at the current 
time. So, could anyone plz tell me which dataset is more updated, specialized 
for machine learning research in IDS?
Thanks
Patrick

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