Whats the best 600w HPS E-bay bulb????

So as it says I need a new bulb and was wondering what you guys think is the best 600w bulb on Ebay.... There are so many choices out there and I am not sure what to go with any advice would be appreciated.

...I like hortilux HPS bulbs, Sunmaster MH

Not sure how long it'll last but the price is right and its bright as fawk: http://cgi.ebay.com/GROWLUSH-600W-HPS-SUPER-OUTPUT-HYDROPONICS-LAMP_W0QQitemZ260467909383QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3ca518e307