First off, it depends on what dough(s) you plan on making with your equipment. I own a Kitchenaid mixer with a 325-watt motor and it has performed well for my wife and me (10 years and counting). I use it mainly for making New York style doughs. My American/cracker style and deep dish doughs are all made with my food processor.
Yes, the price at Target sounds good. Whether or not a 300-watt motor is sufficient or not, I don't know. After having used my KA machine numerous times, my only regret is we do not have the larger, 6-quart model with the flour shield and the better spiral dough hook.http://www.amazon.com/KitchenAid-KP26M1XNP-Professional-6-Quart-Nickel/dp/B0002Y5X9W/ref=wl_it_dp_o_npd?ie=UTF8&coliid=I32QKHO96ZTUT3&colid=3IQ1C5U2OIY02
Bottom-line: you get what you pay for. The KA 300-watt may do it for you, but you would be better served by getting a heavier-duty machine, like the Cuisinart that Essen1 mentioned, especially if you plan on making pizza dough on a fairly regular basis (like every 7-14 days). Better yet, check out the Electrolux DLX or Bosch dough mixer (which can be used for other things besides making bread or pizza dough). http://www.standmixersreview.org/bosch-universal-mixers/http://www.fornobravo.com/forum/f30/electrolux-dlx-mixer-review-3421.htmlhttp://www.amazon.com/Electrolux-Deluxe-Mixer-Standard-Voltage/dp/B001G55QUM/ref=sr_1_1?s=home-garden&ie=UTF8&qid=1316453708&sr=1-1
The prices are a little to a lot higher than buying a Kitchenaid model, but some folks swear by them and will never buy a KA or Cuisinart again. Again, it's a "get what you pay for" kind of thing, and how much do you need for the price for the kind of dough-making you plan on doing.
P.S. I like your name