Digital BW, The Print

Hi again..

Still looking for that elusive double sided matt for my portfolio.
The only real contenders I found are Red River premium matt and 
Inkjetart Duo Brite.
The inkjetart stuff is out of stock and they don't ship to Europe so 
thats dead.
The Red River sounds great but I am worried that the 50lb will 'show 
through' with full prints front to back and that the 65lb is to thick 
to be sewn properly into a book.
Has anyone used these RedRiver papers and can comment on any of the 
above issues?
Ideally I would use PR duo 196 but the cost puts my 2 books at around 
$500!

Thanks

Steve