Having worked with this hobby off and on for a number of years, the one thing I have learned is do it right the first time. It will save you money in the long run. Lighting is the most expensive piece of equipment. I started out thinking I could get off cheap by getting 4 x 65 watt power compact lighting. A few years later, I realize that I was limited in what I could do with that type of lighting. So, now I have a 2 x 175 MH with 2 x 95 watt PC. If I would have just bit the bullet at the beginning, would have saved me a couple hundred dollars.
Buy quality and you won't be as likely to need to upgrade in the future. Why take a chance with inferior bulbs or inferior ballasts. If you have problems with coral growth or algae growth, you will have to determine whether your inferior equipment might be the cause of the problem. Just get good lighting and take that issue out of the equation if future problems arise.