PGS,
I wear a 45-50% density unit with a body wave. And I rotate between all the bases both skin and lace. I use Walker No Shine tape all around and touch up with I Glue or Base Bond. I expose a corner of my hairline as my hair 'breaks' on the left side. Since I wear my hair at medium length (3-4 inches) the 45-50% density doesn't seem thin. People that wear a shorter style would probably go with a little heavier density since they wouldn't have the benefit of the length and wave that adds fullness.
Regards,
John