Besides appraisal for value purposes, you should also have a licensed professional go through the house and seek out potential problems. Of course, you will have inspected the home, but you are not used to looking at some things that a professional will find. Common things to look for in Colorado include mold, radon and lead based paint. Even if they are not things the seller is expected to repair, at least you will have foreknowledge of any potential problems.
The seller will want this inspection performed quickly, so that you can approve the results and move forward with the purchase. Once you receive the inspection, you will want to allow yourself sufficient time to review and approve the report. If you do not approve the report, you may negotiate with the sellers on which repairs should be performed and who should pay for those repairs. Otherwise, you can cancel the purchase without penalty, provided you have included timetables in your offer.
Allow a maximum of ten to fifteen days to receive the report and five days to review it. Here is a sample report from a local inspector that many of my clients have used in the past http://www.hsdi.us/assets/ContentItems/HSDISampleReport.pdf