If you prefer magnetic ballasts because of their reliability you will like the affordable Virtual Sun 400 Watt Hood HPS/MH Grow Light System.
The Virtual Sun is an easy to hang wing reflector and HPS and MH bulbs. This grow light system also includes light hangers and a timer. Its light weight makes it a good candidate for hanging in a grow tent.
The Virtual Sun 400 Watt Hood Makes An Affordable Start Up Set
This is a great starter set for the money that you can use for many years. It can flower a 2.5 x 2.5 area ideally but can cover up to a 3×3 area if you are willing to do some pruning. This is a great size for raising clones and vegging too.