Oops! Sorry, there is no Grade Boy All Stars...they are called Greyboy Allstars. I only knew them from a radio program and it sounded like the announcer was saying "Grade Boy All Stars"! Went to a record store and DISCovered the truth
BTW, I think Maraketz recomendation of Material "Hallucination Engine" is good one, it's more bass heavy & groovy than Praxis (also Bill Laswell produced). Get Material and forget about Praxis, I dont think it's what you are looking for (based on your description).