Remember that this is an estimate to build. each configuration is different so don't short change yourself on the build. By planning the estimate conservatively, meaning high. you won't run out of money when something unexpected comes along. Your buying decision I'm sure has to include other parties involved (wife) and if you are short on funds to finish (sometimes that can be a lot) you will be looking at separating from those other parties involved. It is better to sell the deal to you and your more sensible side with some fluff factor to pay for the coating on the headers you forgot to include or the titanium hardware you have to have.