Aquaculture is good + good service, bit exspensive but you want to order from a reputable store with online and highstreet shops. They do 150w i think and comes with a ballast that you just plug into the wall. The ballast converts the elec to what the plant needs, only thing you might have to worry about is a good timer, highstreet shop ones here dont run big voltages so buy a contractor to make the unit safer and cheapo timer will be ok.
Can call the shop for advice, they are good for questions, google Aquaculture, best i know off, can get cheaper but i pay their prices anyday.
Lighting is getting intresting these days, many options, dont think at that wattage you can get a digital ballast that will run MH and HPS from same unit. I use cfl's and my best advice is t5 or t8 flouros are a lot better in veg, better light spread and lumens.
Also for one pot you could buy a hydro one pot system, are a lot of fun i am told and easy to maintain. Good luck dude.