I agree with the other posters. You'll def want an auto (or grow a photo under 12hr lights so it doesn't get away from you) Another good way to manage small spaces is trellis, trellis, trellis. Some good LST with a trellis to SCRoG a bit and you can grow any cultivar you want, even in a small tent. Just takes much more management and short veg period.. 4 feet isn't much space. You need at least a foot for the lights. The pot you're growing in will take up a foot. That leaves you with about a foot to a foot and a half of usable grow space. To get the most of your space SCRoGing will be your best friend.
Now as far as cultivars go, the tangie and the blue dreams that other posters suggested are great choices. Both are fantastically energizing flowers. One tastes like oranges and gas the other like blueberries and blackberries. I have both curing, waiting for New Year's to smoke up. Another stimulating cultivar that doesn't grow too big is Green Crack. If you can find seeds for it Black Demon and Road Rage OG are also good stimulating cultivars...... Just hard to get seeds and they probably won't be feminized.