I think your light fixture selection depends on the size of the garden trays you are trying to illuminate. If you have a 2'x4' section, then standard (inexpensive) 4' shop lights with T8 tubes from HD would be great. If you are lighting a smaller section you can use the system I suggested earlier with CFL bulbs.
As you have already found out, the "grow" lights from HD or Lowes are a gimmick. Don't over think this. All you really need to get are standard tubes or CFLs. Look for the bulbs that have the highest rated lumens per watt.
Another factor, but not really important for seed starting, is the light color. For early growth, you should get lights that are in the 6500K range. This casts a bluish/white light. For later stages of growth, if you were going to continue to grow indoors, you would need to switch your lights to 2300K lights which are cenetered more around the red spectrum, but since most of you will be moving the plants outside, you might as well get 6500K lights.
I start a lot of seeds and clones indoors, and in my experience, for seedlings, any standard florescent light, CFL bulb or tube will be fine. Do not use any type of incandescent or halide lights. These bulbs generate more heat then lumens.
For the guys who are having problems with the plants "leaning," try moving your artificial light closer to the plants. If you are using florescent, you can move them to within an inch or two of the canopy of the plants. Hold your hand at the plant canopy height under the light. If your hand does not feel warm, then your plants will not burn. When sunlight hits the ground, it measures around 10,000 lumens. The further you move from a fluorescent light, the quicker the lumens drop off. So, if your lights are a foot over the canopy, not much of your artificial light is even making it to the plant, and they plants are leaning towards the strongest source of light.
