The Gujarat state govt has started a company called Gujarat Green Revolution Company Ltd (GGRCL) which aids farmers in the state with procuring micro irrigation solutions.
See below links to PDFs which include unit cost per hectare with & without water tank (15-Oct-2011) for products offered by GGRCL. This may be useful for members in other states as well to get an idea of the costs involved.
Drip Tape based Irrigation System
Conventional Sprinkler Irrigation System
Mini Sprinkler Irrigation System
Porous pipe based Irrigation System
Source: ggrc.co.in/frmunitcost.aspx