There are way too many guns on their site. 

I want to look at a DA/SA with frame safety or decocker in 9mm & .45 with a rail too.

Do such beasts exist? 
Opinions wanted. 
Thanks

If a rail is important to you then you probably want to look at an SP-01 (full size) or P-01 (compact).

http://cz-usa.com/product/cz-75-sp-01-9mm-black-3-dot-tritium-sights-18-rd-mags/

http://cz-usa.com/product/cz-p-01-9mm-black-alloy-14-rd-mags/

I'm not sure that they make a .45ACP (CZ97) with a rail, but I could be wrong.

Going by your wants of:
DA/SA
Safety/decocker
rail
9mm/45

You have:
The compact P-01 and it's custom variant, the SDP.
http://cz-usa.com/product/cz-p-01-9mm-black-alloy-14-rd-mags/
http://cz-usa.com/product/cz-compact-sdp-9mm-black-alloy-heinie-night-sights-14-rd-mags-by-cz-custom/

The the full size SP-01 come in the decocker (tactical variant), the regular SP-01 with safety, then the Shadow Target custom variant.
http://cz-usa.com/product/cz-75-sp-01-9mm-black-3-dot-tritium-sights-18-rd-mags/
http://cz-usa.com/product/cz-75-sp-01-tactical-9mm-black-3-dot-tritium-sights-18-rd-mags/
http://cz-usa.com/product/cz-75-sp-01-shadow-target-ii-9mm-cz-custom/
There's also a SP-01 polymer Phantom that is discontinued. But it still might show up every now and then (it did last year). Or found on the secondary market.

The last are polymer guns:
The mid sized P07:http://cz-usa.com/product/cz-p-07-9mm-black-polymer-interchangeable-back-straps-15-rd-mags/
The full sized P09 come in a few flavors:
black/regular:http://cz-usa.com/product/cz-p-09-9mm-black-polymer-19-rd-mags/
suppesor ready/extended barrel: http://cz-usa.com/product/cz-p-09-suppressor-ready-9mm-black-polymer-interchangeable-back-straps-19-rd-mags/
FDE frame with tritium sights: http://cz-usa.com/product/cz-p-09-fde-9mm-with-night-sights-black-polymer-interchangeable-back-straps-19-rd-mags/

Those are the only ones that meet all your criteria.

All are excellent guns. It just depends on which size you prefer and whether you want a polymer or steel frame. The P07/09 will have a better out of the box trigger because of their newer Omega trigger systems. But with a little range time. All the triggers should clean up OK.

Or aluminum frame. People seem to forget that things like the P-01 are NOT steel-framed pistols.

(All of the non-steel ones are abominations anyway. )

The P07 (compact) and P09 (fullsize) are only offered in 9MM and .40 S&W.

I own a P07 in .40 S&W and a P09 in 9MM.  I've put my Glock, one XDM and both M&Ps out to pasture.

The 9MM P09 holds 19 in the mag and 1 in the chamber.  The .40 S&W P07 holds 12 in the mag and one in the chamber.  

They come with ambidextrous de-cockers installed.  In the box is a pair of ambidextrous thumb safeties with instructions for installation if you'd rather have the safeties.

They are DA/SA and have rails and polymer frames.

This. Both will be 9mm, CZ does not make a .45 with a rail. ()

SP-01 = Full size 9mm ass-kickin' goodness
P-01 = CCW friendly ass-kickin' goodness.

ETA: you can get both in .40 SW though....