If you're looking for a fabric that's drapable, stable and resembles the 'tighter' weave look of most pre-preg parts then I'd recommend using the 240g 2x2 twill as sold by EC. It's a bit more expensive but it'll deliver better cosmetic results than the more common 200g twill fabrics and be easier to work with.
If, however, you're looking for a fabric that's a little less common and stands out more than smaller weave twill fabrics, then it might be worth looking for a 4x4 twill weave fabric, typically available in 285g weight. If you're not expecting too many sharp curves or excessive cutting and jointing then it shouldn't be too hard to work with either.