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IME for a single MH bulb without any additional supplementation, the Phoenix 14K with an electronic ballast gives one of the better combinations of growth with the desired "blue" coloration. Again, depending on the ballast type you are using, you will have to trade off on one or the other...

Even with the Eheims, you should still consider sfsuphysics' advice - Put a mat under it so the pump doesn't rest directly on the bottom of the sump. Use some flexible tubing to isolate the pump from the rest of the set up. These are also cheap things you can do to your existing set...