According to the LBS's catalog, the 06 rockhopper sport (base model) comes with SRAM X4 shifters and X5 rear deraileur.
However (according to my LBS) it seems that specialized is upgrading all of their 06 rockhoppers to X7 gear, and will be retrofitting the X4's in the bikes that have already made it to the stores. So if you are in the market for a rockhopper (06 model) and it has X4 shifters on it, you might get a free upgrade to X7 (like I did)
pics of my new ride:
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Thread: 06 rockhopper sport info