I'm just starting down the strobist path myself and wondering what gear is best to start with. I've read that silver emphasizes contrasts (and wrinkles), so it's more appropriate for portraits of males, whereas your female subjects would likely prefer to be shot with a warmer, softer light. There will be exceptions to any "rule", so that's why I think the best solution is to find a product that offers you a choice of light qualities, so you can experiment with a variety of outcomes. I don't own one yet, but am thinking hard about the Photek Softlighter II because of its versatility, and apparent build quality. It can be used as a silver reflector, a near-white shoot through, and a combination of the two.
At any rate, any product that gives you some options is probably better in the long run. Trouble is, of course, options are (usually) extra!