Hey Burt,
Here's some numbers to help you understand what you are looking at:
If you get 3000 grafts and only implant into the front half of your head (lets assume for now you leave the crown alone), you'll be covering around 80 to 90 cm2, depending on how conservative your hairline is. That'll work out to an average of about 37 grafts/cm2 for 80cm2 coverage or 33 grafts/cm2 for 90cm2 coverage.
If you get 3500 over 80cm2, that'll be close to 44 grafts/cm2.
Of course, you have "some" existing hair there, that hopefully you can keep. That'll add to your overall density.
What that will look like in the end depends on many factors like hair caliber, contrast, number of 3 and 4 hair grafts etc.
Hope that helps.
Gorp