Pretty much any Indica dominant strain would be OK. Of course there are a few exceptions. But they usually grow pretty short.
Have you bought the light yet? If not make sure you get a ballast that is convertible from HPS to MH. That is what I use. And I use the MH for Veg and the HPS and MH for flower. Three days of HPS 1 day of MH.
Easy buds to grow would be either Big Bud or PPP (Pure Power Plant). Both of the strains should be good for a begginer and both have a high yield.
Trustworthy seedbanks would include Nirvana, The Attitude Seedbank and WorldWideMarijuanaSeeds.
I am growing 4 plants in 5 gallon buckets and 1 still in a 16 ounce cup and on top on 1 gallon of soil and 2 babies in 16 ounce cups all under my 400 watter. Like the guy above me, I too veg with MH and flower with HPS.
You can check out my grow in my signature bar right below to see my babies. Vegged at 1 month and 12/12 in the morning. Well happy growing!!!!