My current EDC belt for IWB is a DalTech Force Superbio. Appearance wise it simulates leather but it is actually a polymer formed around an internal webbing. It has held up better than any other belt I own and I have worn it more regularly than any other belt since I got it.
I also on occasion carry with a BullBelt Steel Core belt. I got one in Distressed Bison for my sister-in-law's western themed wedding to match the boots I wore. Hey, made a great excuse to buy another gun belt
. Anyway, I haven't worn it alot but I do like the way it looks and it has held up fine for the little I've used it.
If I am not carrying (usually at work) or pocket carrying, I wear an Aker B21. I've gained weight since buying it so it got pushed out of the IWB role, but fits ok when that isn't the case. It's been solid, although it has a significant "curve" (my SuperBio has a curve as well but nowhere near as pronounced) where the holes are probably thanks to my gut and the fact that that is where the kydex liner stops. If it still fit me for IWB, it would be my second choice after my SuperBio.
The other belt I have owned was one of the Kore Essentials gun belts. In theory, I loved the concept of this belt and understand why people like them. The ratcheting buckle system allows for much better fine tuning of fit and it was comfortable when I wore it. My issue was, again likely due to my gut, the teeth that hold the buckle to the leather portion of the belt started to pull through the leather and the buckle didn't fit as tightly as I would like. I ended up selling it to someone to cut it down from my size and has been very happy with it. I can't personally recommend it from experience, but people seem to really like them and to be fair I never did contact Kore Essentials about my issue.
Based one what I've owned, you've probably gathered I don't like spending alot. All the ones I mentioned are still under $70 I believe.