Lights- Calculate based on the formula in my noob instructions sticky. Watts, time on, your kWh rate.
MH is vastly superior but unless you are flowering under at least 600w HPS, using one for veg is likely to be overkill. Totally dependent upon your grow style and how many mothers you keep. If you keep a significant genetic library, you definitely want a MH for them.

Strains an SOG- Good choice for a style. SOG is efficient. Try Hindu Kush or Papaya for big yielding SOG strains that are easy to grow.