It depends to some degree on the volume of grapes you plan on fermenting at a time. If you want to make the equivalent 6 to 12 gallons of wine from grapes as from 1 or 2 kits each harvest season (that is, California in October and Chile in May), then you probably would do best to rent the equipment Wade referred to than to buy your own. The crusher/destemmer can easily run $400-500 new, and the press can be $350 or more for the smallest volume. By contrast, I rent Fine Vine Wines' equipment in Dallas for about $25 (where I pick up the grapes), get to use some of the best equipment available, and don't have to store or maintain the equipment for the other 363 days of the year.
Once you get past pressing the grapes, then the equipment needs are no different than a kit's requirements. Like Wade said, you'll probably want to get into testing and adjustment of the acids, sugars, pH, etc. I have used old Mosti Alljuice buckets for the grapes (the volume with all the grape skins is much greater at first than with kits) - for 3 lugs, which make a total of 6 gallons of wine when finished, I used two 7.9-gallon buckets with the buckets each about 2/3 full; so 6 lugs required 4 7.9-gallon buckets. If you want to do more than 12 gallons at a time, you'll probably want to get bigger fermenting buckets, and transport starts to become an issue to, unless you live very close to wherever the grapes are delivered.