Schlage (BE469) seems to be the standard. But I'm not sure if there is something else to look at.
Yes it MUST be Zwave and I do have a very solid repeater (Ecolinks new siren) right above the door.
Must also have a key back up. Seems that most do but I want to rule out the ones that don't.
Keypad isn't really a requirement but it seems like it's kinda standard.
Edit:
BE469s seem to be kinda hard to come by.
Schlage are not officially supported by Hubitat, so wouldn't be my first recommendation. Even though I have a Schlage that works fine, others have issues.
Is the siren a mains powered device?
I know there are those here who are not fans, but I have a Kwikset 914 Zwave+ and it's been rock steady. It's supported as a generic z-wave lock device. Just be sure to get the zwave plus version. I think the older zwave is still available some places that have old stock. It also comes in a zigbee version.
Yep mains powered
I've been seeing that. There price of the 914 is very attractive too.
Good that it's mains powered - hopefully it's a beaming repeater, but best if you confirm that. Should be something on that in the specs/description, or maybe someone here will know.
Frankly I would normally suggest a Zigbee lock but given the issues you are reporting on the other thread, maybe not the best choice for you at this time. 
My kwikset 620 has been fantastic!
Just ordered a kwikset 914 should be here Wednesday.
Yeeeeah I have never had a single issue with Zwave. Also my particular mind set is to have "mission critical" type stuff in Zwave.
Might be too late since you already ordered something.
But I’ve been really happy with a Yale Assure YRD-226, which has a single-cylinder keyway and a keypad.
I use it with zigbee, but there is a z-wave version as well.
It’s actually possible to replace the “smart” modules that the lock uses, in case the module dies, or even if you want to switch from z-wave to zigbee in the future (or vice versa).
The Schlage locks have a ANSI Grade 1 security rating. Most competitors are rated Grade 2, which is less secure.
Unfortunately, the price has gone up a lot since I purchased mine.
Just keep in mind what @danabw said about beaming repeaters.
Depending on what other z-wave devices you use, you may not have needed one yet to ensure a good experience.
A z-wave lock will probably need a beaming repeater, though.
(sorry for the totally off topic) even if a device is battery powered, you can unofficially make it mains powered. check out "Lenink" on amazon, they have kits for doing this. just be sure to select the proper one as the power supplies are different depending on the number of batteries
edit: to add clarification in case it causes any confusion, this will not magically turn a battery operated device into a repeater, that is determined by the device and not the power source. it will save you from having to change batteries though
I doubt that hacking the battery power in that way would allow it to function as a z-wave repeater?
Those Lenink kits work great - I'm using several now and am very pleased with them. But I'm pretty sure they won't magically enhance a device's repeating behavior or anything along those lines.
yea, it wouldn't since the device would still see it as battery powered and not function as a repeater
Right, so it’s an interesting mod to be aware of in general.
But OT in this thread, as you acknowledged (and TBH probably confusing to less experienced users without a clear caveat that doing so won’t change its status in the hub’s z-wave mesh).
FWIW, I'm super happy with my 2 Schlage, both the zwave plus and the zigbee version
Kwikset is my favorite. They are available in Z-wave or Zigbee. I have only ever tested the Z-wave version and works great.
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