I've been using AOR Ortho-Minerals, and some specifically targeted extras. ...Though they all have their pluses and minuses, and I have yet to find a brand that's perfectly suited to our needs. In general, I've found the higher priced supplements generally much more absorbable and closer to what would be optimal. No use paying half price for something else and then getting much less than half of the value because it just goes straight through or the minerals compete with each other too much for uptake.
Things to look for:
Mostly I would suggest you pay attention to what each mineral is bound to (e.g. if it says "citrate", "malate", "glycinate", "aspartate", etc.). Cheap supplements will often use things like calcium carbonate or magnesium oxide, which are cheap but not generally well-absorbed. Certain ones can be a problem for some people (e.g. "aspartate" is listed as a no-no where possible according to Amy Yasko because it can be extra strain on an already over-excited brain; We are also often high in glycine already, so that may be one to limit if possible, though it does tend to absorb well). Malate will give you malic acid, which may have its own benefits for us (it's been studied in fibromyalgia patients, and may also have benefits against certain heavy metals and muscle issues), so I'm a fan of that one. Selenium in high quality supplements sometimes comes with methionine (a sulfur amino acid), which might be a plus or a minus depending on your view. Some of us have problems with too much sulfur, but we also don't tend to be great at methionine production. Plus, anything bound to an amino acid tends to be very well absorbed. I'm a fan of malate, krebs, and then citrate, followed by the amino acids (lycinate, glycinate, etc.) but that's just me personally. I seem to recall some people having other issues with citric acid.
Other things to watch for are the amount of iron, and possibly copper, depending on your needs. Those are two that people sometimes need to limit.
Hope that helps a little.