While that's a pretty good price on a 150w, I would go for a 250w for two plants...100w of quality light per plant would be better than 75 imo if you can swing it financially, but you have a little time while they veg, so save up! A 150w will do, but if that's all you can afford, go with an HPS, not a MH! You'll be using it mainly for flowering and an HPS is better at that than a MH.