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What kind of substrate are you planting it in? If you have the right nutrients and lights, DHG will root pretty quickly and this shouldn't be a problem.
This is a little out of your price range, but you can find similar fixtures for less if you look around, I am sure. A dual 20" T5HO would be a kick butt fixture on a 10 gal tank... it will require CO2 injection (DIY will work fine) and fertilization though... probably a little more maintenance and a careful watch compared to the 20w you are currently rocking.
I also think this fixture is very sharp... but also a few dollars more than your budget... but something similar would also work well. It is compact florescent rather than T5HO.
well... I wouldn't go much more than 36. 36W of T5HO or CF on a 10gal will grow just about any plant you can find if the other nutrients and conditions are right.