Solved
@ Kelly, CanAmdelta and QFF - Thanks a ton for solving my confusion. That made it clear for me which ones to buy, and now I will go for the battery powered ones.
@ RatstoreA - I am trying to find a good deal but cant find any. I will be buying them from the States through a friend. Its 850 USD for the battery ones and $900 for panel powered. If i find something i'll let you know.