I just know that I will not be able to afford HPS on my electric bill
In that case you'll want to consider the LEDs used in a fixture. Epistar/epiled are common and you'll need about 50w/sq ft. Produces about as much heat as a HID. However, these fixtures are inexpensive (Vipar-eBay, TopLED/MarsHydro).
The ones to be careful of are Kind, Lush, HydroGrowLED, Blackstar, GrowBlu, Blackdog, Cali Lightworks. But, they're expensive. And, they don't publish the LEDs they use. As hype-driven as these brands are, you have to wonder why they don't publish the LEDs they use. If it was anything to brag about, you know they'd hype that too. The silence can only mean they're not something to brag about.
@Smokenpassout said the last two are reputable. But, so are the others. They're reputable in terms of people having good grows. On that criteria, TopLED/Marshydro are reputable too. There are plenty of people running 50+w/sq ft who get good results. We still don't know what's in those expensive lights.
For the same money you can buy A51, Rapid/Onyx, Bonsai/Hans. They use Cree or Osram. You'll need about 35w/sq ft. Much less heat, which is less electricity cost for cooling your space. AdvancedLED appears to be good too. Not as informative as the others about their spectrum, but they use Cree.
Just be careful. Newbies to LED often get sucked into the expensive mystery lights which are believed to be little more than rebranded Chinese lights. If you have that kind of money, get one of the more transparent and efficient lights. If you're not prepared to spend that kind of money, try Vipar-eBay or MarsHydro. You should get something close to the mystery lights without the expense. (But, I think you'll find it's not better than HID.).
