I'm currently on
Buzzard News. It's 6.95(USD) a month for 1.5GB, with daily rollover.
It's been pretty good so far.
One thing to do is look for a news program that lets you specify multiple servers, and itll grab articles from the one before the other (if it has emm) and to use your isp's as the first, and your pay one as the second.
You can just buy a block that way.
a suggested site for info
http://www.newsgroupservers.net/