I'll ask the same question I always do: what do the other girls wear to competitions in your area? You don't want to be too fancy or too plain ... and do most of them wear custom dresses? If most are using stock, then, I would look at the Jerry's stuff - it's well made, not too expensive, and there are a range of styles, and I know you could find something that would suit the music.
If you're having it made by somebody local who is good, then, I would ask them for guidance on what is appropriate for your child's test level, and also for suggestions on a style and material that will work with both your music and your budget - and your daughter's physique. Little details can really bump the cost of a dress, so, I'd check in with your dressmaker; plus, some dressmakers have preferences in terms of the styles or types of material, finishing etc ...