If only they weren't called
pixiehost, kinda takes the masculinity away from it
Anyway, to store 5-8GB of files and then to have members download them all, you're seriously looking for a lot of bandwidth. Space can be accomodated for but the bandwidth...how many times will these manuals be downloaded every month approximately? If it's a big number, you'd have to go dedicated unless there's a host out there that gives enough premium/reliable bandwidth and has a powerful server with at least a 100mbit port...
My suggestion is to go with a $99 server from Rackshack, check out their 'bargain basement', great deals.