First off, why 8x10? As a photographer your work will show better in a larger format. My book is 11x14 and IMHO, has much more impact than the smaller 8x10 size.
As far as what images, I've said it before; this is your calling card and MUST be presented thoughtfully to land you the job. Your opening image should be the best or near the best in the book. The images must flow together well and be arranged so that portraits face inwards and you shouldn't mix landscape and portrait orientations on facing pages.
The book itself should also be of good quality. I prefer books by:
House of Portfolios Brewer Cantelmo
They aren't cheap, but will last quite a long time if cared for properly. My 11x14 book from House of Portfolios is going on three years and is in excellent shape.
Good luck!