Presentation portfolios

Finally decided to get around to putting together a portfolio of my prints, up until now they have just been sitting in carboard tubes.

I'm looking for something along the lines of this:

http://www.londonart-shop.co.uk/present/photo-pres.html

My prints are 12x16" and this is the biggest these portfolios come, I'm really looking for 16x20" so my prints can be mounted and matted. Since I'm paying quite a lot for some of these prints, pages MUST be archival quality and have good clarity.

I'd like to not break the bank and keep it under £150. Any recommends?

Have a look at Silverprint near the Old Vic

I'm not sure about that company, but if you want a portfolio with the plastic sleeves make sure they are the kind that can't get all marked up. I have some lower quality ones that look terrible after use.