Choosing a sativa

I need a very small sativa, for a flowering space of about 4ft-4.5ft tall, 3ft-4ft wide and 2 feet deep.

Any suggestions?

I want something with a really strong cerebral high.

No sativa strain prefers to stay short, that's kind of a paradox you're working on there. I would say look for a hybrid that has been bred to be grown indoors. Look for Romulan, Durban Poison, Silver Haze, Super Haze, and Trainwreck. Those are all sativa's that will work indoors, but their height depends on when you flower them.

try lowryder or somethin then man either that or the wreck

Try Snow White from Nirvana. Excellent mid sized plant. Not alotta branching, stays soewhat short and very compact.