draigg, Nashbar has these trekking bars at a good price for a trial run:
http://www.nashbar.com/bikes/Product..._200276_200388 . Shimano Acera
http://techdocs.shimano.com/techdocs/blevel.jsp?ASSORTMENT%3C%3East_id=1408474395181679&FOLDER%3C%3Efolder_id=2534374302051137 is a great value if you're going to buy new. While there isn't alot of cosmetic flash and they're only available in 8S (my preferrence so consider the source) the group has been a workhorse for years benefiting from trickle down enhancements.
Brad