A 400w or 600w hps will be plenty for that size room...I use a 400hps in a 4'x5'x7' with excellent results flowering 4 to 6 plants. Truthfully, you don't need a special area for clones/mothers...just a shelf or two in the veg room is usually fine for clones, and mothers are not that particular...I move mine all around the veg room and just rotate them 2-3 times a week. More flowering room would be nice, but what you have will work. Personally, I like a veg room I can move around in as this seems to be where I spend the most time working with the plants, (cloning, topping, FIMing, etc.) and it's nice to have the clones, mothers and veggin stuff all in one room. Good Luck with this!