On Richard Lainhart's site he recommends these. They're not cheap but nothing good ever is.
http://www.markertek.com/Product.asp?baseItem=SC100MM&cat=CABLESCONN&subcat=AUDIOCAB&prodClass=AMINMIN&mfg=&search=0&off=
Message
Re: [PLAN_B_analog_blog] 1/8 vs. 3.5mm
2009-02-13 by Richard Lainhart