i use a boss odb-3 and i enjoy the tone i get from it.
+1
If you want a decent, cheap OD then look no further. I can get Lemmy & Flea with my Jazz and Geezer with my Precision plus it has a 2 band EQ so you can dial in as much low end as you need. I was planning to replace mine but it's really good and used ones are cheap as dirt (geddit?!!)
What I've decided to instead of replace it is add a Darkglass Vintage to my arsenal.