I'm not an expert, but here are the stats of Pornolab as of Jule, 19 (2011) - found in their forum:
Registered users: 1 720 756
Torrents: 182 328
Total size of torrents: 274.679 TB
Total # of snathces: 219 891 098
Looks like if you join there you won't need any other trackers.
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