Originally posted by loco I do want to use flash...
Then the simplest option is to stick with the Raynox. For more magnification, the cheapest option is to get some (1-3) used A-type TC's on eBay, probably about US$20 each, and remove the glass. Or look for a set of A-type macro tubes, but those are more rare and costly. A-type extension (with aperture-control contact pins) won't have AF, but that's usually pretty useless in macro shooting anyway. ANY macro setup will have monstrously thin DOF, as you found with your Raynox. That's just how it goes.