I came across this mod on the Minecraft forums: QuarryPlus It's a second tier for the quarry and can mine with silktouch, fortune, builds awesome scaffolding and removes lava and liquids in it's path. The mod developer is Japanese who just started posting on the English forums so communication is a bit tricky but he has been fixing bugs within the hour. Cost wise it seems balanced enough by using actual enchants from a diamond pick and in the later versions there are config options for power usage. Afaik Buildcraft is opensource and he isn't modifying the actual quarry so IP wise it seems ok. Apart from a minor ID conflict it's been running fine alongside my 152 0.8 wgt instal. Give it a try!