Here's some high quality options for historical OR magic rare low fantasy medieval gaming:
1)
Lionheart from Columbia Games. This is a rules generic sourcebook to roleplay in medieval England.
$29.99 http://www.columbiagames.com/cgi-bin/query/cfg/zoom.cfg?product_id=7001
2)
HarnWorld from Columbia Games (also see the
Harn Manor, Chybisa and
Kaldor supplements). HarnWorld is the most authentic "dark ages/medieval" experience you'll get in a magic rare low fantasy setting, right down to the last nitty-gritty detail. It's rules generic, so you can play with D&D/d20/OGL or the grim-n-gritty
HarnMaster RPG. You can't get any more "old skool" than this classic setting that's still chugging away after 20 years +!
$29.99
http://www.columbiagames.com/cgi-bin/query/cfg/zoom.cfg?product_id=5001
3) The upcoming
A Game of Thrones RPG from Guardians of Order/White Wolf (Sword & Sorcery). It's out in late August (the deluxe
$99.95 dual statted d20/TriStat edition; otherwise, you'll have to wait for the
$49.95 standard d20 only edition in October). If you've read the
A Song of Ice and Fire novels from George R. R. Martin, you know what I'm talking about. The setting is a magic rare low fantasy version of England during the War of the Roses, concentrating on sinister politics and open warfare between rival noble houses.
http://www.guardiansorder.com/games/got/ (click the book image for details)
4)
Aquilonia from Mongoose (for their
Conan OGL RPG). Aquilonia is a very medieval nation. The
Conan RPG is great (the rules and the magic rare low fantasy setting, which is loosely based on medieval Europe).
$34.95
http://www.mongoosepublishing.com/rpg/detail.php?qsID=800&qsSeries=7