Lots of options
I'm running three 10G's right now, all with slightly different lighting configs, all are working out for the plants in them.
First thing, what equipment do you currently have? Fluorescent hood, incandescent hood, strip light, nothing? I might have some suggestions for your current setup if you want to leverage what you already have.
If you are just starting out, might I suggest...
My very heavily planted 10 which has DIY CO2, currently has two 15watt stand-alone Perfecto strip lights (fluorescent). The strip lights were ~$23/per at PetSmart if you do a price match to their website. They come with an acceptable Eclipse "Daylight" bulb, one of which I traded for a slightly fuller spectrum philips bulb for ~$8 to give some greater range. I have an All-glass cover ($11), but am not currently using it due to my plants needing a bit more "head-room" since many are growing up out of the water. I've got no less than 14 species of plants growing in this tank, nearly all are flourishing. I will add that I have a full cover of duckweed as well, but that hasn't seemed to hamper the growth of any plants thus far. The only plants that haven't taken-off are a couple of sprigs of Cabomba that I tried to save from my daughters tank about 4 months ago before I injected CO2 and upgraded to my current lights. I thought they had died a while back, but they seem to be hanging on and I won't give up on them just yet.
I'm not an expert, but putting Metal Halide on a 10G tank sounds like overkill, expensive, and potentially tricky/dangerous due to the heat output. Of course you could mount/hang MH up away from the tank, but you would likely have to cover your eyes when you walked in the room

without an enclosure. For the amount of success I've had with my tank(s) so far with a varied list of plants, standard fluorescents seem the most reasonable and convenient when dealing with small tanks.