I personally would try to do a little of both, If you can get into a local newspaper at decent rates than do it. With the internet you are going to reach a larger target audience.
We have some great investment opportunities in Florida. After the real estate boom here prices have fallen. I also see many distressed properties that can be picked up below market value.
I am currently using the mortgage calulators by ARSIDIAN LLC. The calculators have worked well for me and are easy to incorporate into your website if you like.