I have a PPS I purchased on the EE on the way and I am looking for a IWB holster for it.   I have  a Super Tuck for my FN but I was thinking of something with a single clip for the PPS.  What do you PPS owners recommend?

Check out Cooks Holsters.  I ordered my PPS and holster the other day.  Can't speak about them other than what I've read.  Good luck.

Check out Panther Concealment

I use a Fist Holster K1 kydex for most small autos

Best I've found for appendix carry

I carry mine in a Comp Tac MTAC.

I hear good things about the MTAC (especially for hot TX summers) and the FIST, but have not used them.  I would recommend leather mainly because that's what I prefer.  I carried my PPS in a Crossbreed for about two years before switching to a couple of others for that gun.  If I had to do it over again, I'd get an Ozarks Holster for a hybrid choice if they offer it for a PPS (If they aren't listed, he can still sometimes accommodate you).    Many folks have a noise/squeaking issue with the CBST's.  It can be dealt with but Ozarks Holster just makes a superior product to the CBST in my opinion.  White Hat is good but not as good as Ozarks.  http://www.ozarksholstercompany.com/

For some fine leather, try:
http://www.miltsparks.com/    -The finest IMHO   99% (nobody's perfect)
http://www.rgrizzleleather.com/    -Outstanding   96%
https://www.nightingaleleather.com/     -Quite a bit less less expensive, and far less wait time.  About 90%+

I have and use holsters from all of the above except MTAC and FIST.  All are very good to deal with.  

I have found that I like to almost double FBI cant angle.  Like 25-30 degrees. I also like two anchor points.   But that's just me.  Good luck

For a single clip holster, I'd go with Theis Holsters.  Reasonably priced and not a lot of production time spent waiting - unlike a lot of holster makers.

Theis

Here are the IWB holsters I use for mine:

Wright Leather Works - Used the most. Replaced the leather straps with clips so it sits lower.


White Hat Holsters


HarWell Clip N Go



And some OWB:

On Your 6 Designs


Wright Leather Works - Used the most when carrying OWB