1. a 2 inch drop will be fine. my friend is dropped NEAR 3 inches in his DC and he's about 6 feet and 200+ pounds. it seems fine.
2. a LOT of people, including myself, will recommend you get Full coilovers. Function&Form Type 1s are a great basic set at a mighty fine price. The ride quality is preset and cannot be changed, but it rides smooth for its price. best bang for your buck. if you're looking for a shock and spring combo, Ground Controls and Koni Yellows are the best combo in the market and the price is perfect. If you're feeling baller and you want a great adjustable ride, get GC+Konis.
3. a LOT of people will also recommend to get a camber kit, but some will say you don't need them as well. it depends on how low you're going, but you said about 2 inches, and i'm lowered about the same and i'm riding fine without them. it doesn't hurt to have a camber kit though. if i had the money, i'd buy some.