Milt Sparks VMII IWB Horsehide.
1) I can wear it all day with little discomfort
2) You get what you pay for...a very well made holster that will hold up
3) Made in the USA
4) Outstanding resale value (sometimes more than what you paid for it seeing as there is a 6-8mo wait for new orders)
I am not a big fan of kydex (maybe for the same reason I am not a fan of Glocks?..can't quite put my finger on it). I have tried many leather holsters (both cheap and expensive) and come back to the Milt Sparks VMII (now my first choice). They are costly but well worth it to me.
Thanks and good luck with finding the right one for you!