Application Search Engines

[C]

Hi,

I am starting to develop an ASP.Net app that will have a
search section that will allow the user to search the
site.

I have come across the google search appliance which is
quite big.

I am currently considering freefind.com search product.

Does anyone else out there know of any good search
engines I can use?

It is a small application (about 10 aspx pages).

Thanks in Advance,
C