[url="http://www.thewho.net/whotabs/equipment/bass/equip-entwistlegear.html"]http://www.thewho.net/whotabs/equipment/ba...wistlegear.html[/url]
[url="http://www.talkbass.com/forum/showthread.php?p=6337418"]http://www.talkbass.com/forum/showthread.php?p=6337418[/url]
That should get you off to a start. But it sounds like you want a nice low gain overdrive, for which I would recommend a DHA VT1, Barber LTD SR, or a Sansamp BDDI or VT Bass.