My preference is for the ones with a long, curved blade rather than a pointy pokey tip. Yeah, that description is clear... This is my favorite:
http://www.nancysnotions.com/product...seam+ripper.do
I've tried the ones that say "surgical blade" but prefer a bit more handle than most of those had. Also tried Gingher's; loved the blade, but it was just too cumbersome.
Cripes, I sound like the Princess from Princess and a Pea...
Anyhow, I can no longer find my fav's locally/in LQS, so order them through Nancy's and when I can't find any of them any more, order 3 more.