I am also new to saltwater, and I am definitely not an expert, but here are a couple thoughts on this.
You can grow coraline algae on LR with fairly minimal lighting, if that's all your looking to do. I'm not suggesting this is the way to go, but budget constraints in the beginning forced me into a little experiment. I was able to pick up one of those 48" dual strip flourescent lights for real cheap. I put in one 40w actinic and one 40w 10,000 bulb. So, I have 80w on a 55 gallon tank. After 2 months, my 50 lbs of LR is about 1/2 covered with purple, red, green, and blue. It's great. I just made sure there was good calcium levels.
Very soon, I hope to replace those lights with a little better like the Satellite SunPaq power compact which will give me 130w and give me some more options. These appear to be only about $100 from different vendors. Not bad. I welcome any feedback/reviews on those lights.
It sounds like you may be in the market for something better, but I throw this out there for the other folks like me on a tight budget.