Want 200 HP at the wheel's... With a 1.7

dpends on what u want. Nitrous is the cheapest and easiest way to make your goal. A good NX wet kit and a 75 shot will get u there with a few other bolt ons. As far as turbo kits goes they are expensive, but can be cheaper in the long run (dont have to fill up nitrous bottles). The only issue with turbo is u will have to get rid of that brand new header u just bought. Sounds like u dont want to do that. As far as naturally aspirated goes, 200 WHP D17 is very hard to build. After spending thousands and thousands of dollars building the bottom end, balancing it and throwing in a crazy high lift high duration cam, serious port job on the head (like a DPR stage 6), very high comression, and much much more u might make 200 WHP, but unfortunately it wont be streetable. It will be a drag only engine. I would reccomend some sort of forced induction if u want that power level out of a D series. As far as which one the choice is yours. THere are disadvantages and advantages to every one.