Not sure exactly what all of your concerns are, but there are relatively few holsters that are STRICTLY CC or OC. Any decent outside-the-waistband (OWB) holster should work really well.
If you want the best deal on real leather I've used, try Ray's Holsters.
http://www.shado.com/vmchk/Holsters/View-all-products.html
Very nice leather gear, usually at around $35.
Regarding a thumb-break (that strap you mentioned). If you don't want one, that's fine. However, when open carrying instead of concealed carrying, they are not a bad idea. Not a "do-or-die" issue, but don't jump to a holster without a retention device of some sort without thinking carefully about it.
Regarding the drop-thigh holster style ... In my very humble opinion, "tactical" drop-thigh holsters are really not what you want. They aren't very quick on the draw. Are not terribly stable (they move around, ride up, bunch up your pant leg, etc). Are not very comfortable. And...(here comes the opinion part) they SCREAM newbie/fanboy/poseur/mall-ninja, etc. Unless you are in a SWAT entry team or some military unit that issues them, and there are specific reasons (usually related to interference with armor, other equipment carried on your belt, etc.) that you need to relocate your holster down off your belt, there are few compelling reasons to use one. They do not secure your gun as well as a decent belt holster. They are a compromise driven by issues that you as an average joe civilian don't have to deal with. Aviod them. (Unless, of course, you complete the look with bloused trousers, fingerless leather gloves, Ray-Bans, and a "Call-Of-Duty 4" tee-shirt.
)
Good luck! And kudos to you for exercising your rights! (Now, go make sure you know EVERY inch of the firearms law in your state...you're going to need it!)
[EDIT:] Here's the perfect thing for your CZ:
http://www.shado.com/Leather-Holsters/Bikini-Leather-Belt-Holster.html Not going to find a slimmer, less bulky OWB holster than that (the slimmed-down "belt-slide" version of a pancake holster). Available left-handed for the CZ at $30.
Or this:
http://www.shado.com/Leather-Holsters/Sable-Leather-Belt-Holster.html Which is a more complete coverage (VERY good idea with Open Carry) tunnel-style holster and the one I use myself for my 629 in competition. Available left-handed for the CZ at $35.
Both are also available with the thumb-break, if you decide to take my advice and use retention when open carrying.
-Sam