Holy crap, man! You need everything! Yeah, I would definitely buy that CTR front clip if it is really only going to cost you $4500. A wrecked Si will cost about the same, but the CTR is worth more to you. The main disadvantage to buying a front clip is that you have to get rid of the shell of the donor car. If you're going to buy the wrecked Si you have to do that anyway, and with the CTR you'll get 25 more hp and the best front-drive transmission Honda ever made, not to mention all the extras I mentioned in my last post. You could just buy a full engine swap and look around the boneyards for everything else you need, but that might end up costing you more when you consider the time you would have to put in shopping. Buying individual parts can nickel-and-dime you to death, too. My $.02: buy the CTR clip, pick up a USDM Si harness from ebay, and end up with one badass Civic.