I like the interchangeable sets from Knit Picks http://www.knitpicks.com/needles/Kni...__L300301.html
and WEBS http://www.yarn.com/webs-knitting-ne...able-circular/
. Both offer sampler sets that include tips of the various materials. Right now I'm trying to convince myself I can afford to order a set of the wood interchangeables. I like the way the wood feels but mainly the points seem sharper on them than on the metal ones; otherwise I like them both. I don't like acrylic.