Having multiple portfolios catered to specific positions is a good idea if you have a variety of skills. It's also a good idea if a specific position opens that you want to adjust your portfolio and the wording of you resume specifically for that position.
How about doing a portfolio page for a few different positions and submitting links directly to the relevant page with the thumbnails and the contact info at the top of each page? So you could have a general site but also have a several self-contained, organized portfolios? Also, how much material would you reccomend? say…
How a portfolio page should look: your name contact information position seeking link to resume (optional download resume doc or pdf) 8-10 pieces of your BEST work (optional download demo reel though some require it) Be sure this section is focuses on the position you want. For example, want to be a 3d game character…