Man, seems a strange scenario to me, on one hand you want to grow an impressive plant, well that could be either a huge plant, a very potent one, or a finicky long flowering sativa that yields low but is a true connoisseur smoke, at any rate to accomplish this is going to take a decent upfront capital investment on your part, nothing insane but at least around 3-400, now if you go the cheap rout you can get a plant to harvest with just a few basic nutrients and cfls, but that won't really impress your growing friends. It's also a pretty decent legal risk depending on your location and seems not worth the risk for just a hey look at me kind of thing....perhaps just grow a record breaking tomato or pumpkin, both would be pretty damned impressive to just about anyone who's grown anything.
