information with lights

hi

i am nearly finished my grow and want to do it better next time. iwas thinking of getting a hps light .

would this one be ok? and if so how many plants could i grow with it??

http://cgi.ebay.co.uk/New-600w-Indoo...QQcmdZViewItem

You know there's better lights out there right?

Are you looking for something inexpensive or ar you interested in air cooled lights?