With all the different systems out there it is a bit overwhelming on which one is a good place to start. Blue bowls, spiral panning wheels, gold cube, mini sluices.....   I've even heard that some will mix their black sand with vinegar in a rock tumbler for 24 hrs. then combine it with salt and heat it   I'm sure each one has its pro's and con's and probably a lot is personal preference, but does any one type stand out above the rest?  Ultimately after all the research I've done, I'm leaning toward building my own from a blue bowl combined with a mini sluice with a vibrator attached.  Any feedback from experience using the different methods would be greatly appreciated.