Pillar to Post is another excellent company. I don't have their number on me though.
You'll have to ask them about guarantees. Each company does it differently. Rates will be comparable and you should get the package deal--structure, termite and radon. Yes, we do have radon in Monmouth County. If you contact me through Trulia or my website I can give you more specifics regarding their pricing. I am not at my office now. I have a coupon for $25 off for Pillar to Post.
Honestly, they guarantee pretty much nothing. They will give you a lot of great information about the home, but it's just that, information. The ultimate responsibility is yours. You could conceivably sue if a huge defect is missed out of negligence, but the bottom line is this rarely succeeds.
The charge is typically around $500.
I've had good results with Jim from the company below. He does a thorough inspection and uses the latest technology including fiber optic scopes for fireplaces. His website contains a PDF of a sample report so you can see what you will be getting.
As Marc indicated, there aren't really guarantees. Most agreements that you sign w/ the inspection compnaies limit their liabilities and exposure.
Deborah Madey - Broker
Peninsula Realty Group
You should try to contact at least home inspectors that would cover the general area of the home you are purchasing. It's a good idea that the inspectors are members of ASHI, that's a good indicator that the inspector is a qualified professional. The home inpectors will generally inspector the interior and exterior of the property and depending on the size of the home could take an hour or more. If the home has a basement they may also lead a radon cannister for the radon test. They will also do an inspection to see if there is any termite damage or infestation. That overall could cost anywhere from $400.00-$500.00 but it's well worth it. And if you are available to go with the inspector, make it a point to be there. You will learn alot. Best of Luck to you. Lucy