Please suggest me a good usenet/rss desktop client

[Ottavio Caruso <ottavio2006-netbsd%yahoo.com@localhost>]

I am looking for a good usenet + rss client with the following features:

- Can run on both Netbsd and Windows
- Profile/settings are portable and can be exchanged between the above
mentioned operating systems
- RSS can be arranged in folders and subfolders
- Has a "killfile" feature

My first choice would have gone for Thunderbird, but, looking around,
I only find negative reviews for it and my last experience (a couple
of years ago) was disappointing.

Your advice please.

--
Ottavio Caruso