Blacktrack is essential...but I would also recommend Blue Peep and Brassy. If you change your mind about purples, I ♥ Macroviolet. (I think purples flatter brown eyes very nicely.)
here's a little chart that i made last month for the heck of it. it was posted on my livejournal. it's easier to make a decision when you can see it on someone (bare eye - no eyeshadow, mascara or any other eye products):
hope this helps! i only have these shades for now, but i love fluidlines so i'll be getting some more very soon