What mobile network are you shopping for? That's going to be a huge driver on what choices you may have. It's worth noting that there have literally only been something like 30-or-so QWERTY cellphone models released by all the mobile manufacturers over the past five years. A third of them by Blackberry, and at least half of them are 2G GSM only or non-US mobile band devices or obscure brands that have zero used market availability after the model was discontinued.
If you're wanting to do T-Mobile, there's literally only one choice: Blackberry Priv, an Android handset with a slider keyboard. Why? Because it's the only phone that has LTE Band 12 VoLTE support, and outside of a very tiny 2G network footprint that will be congested with all their legacy users who haven't upgraded handsets, Band 12 LTE is going to be the only mobile voice reception you'll have on T-Mobile very soon.
There really haven't been many/any released for Sprint compatibility. Verizon has a few more if you're willing to mostly restrict yourself to LTE Bands 4 and 13 with coverage, but all of them but one LG handset (an Android slider), are Blackberry.
LTE is also a major battery suck with all devices.
The best network for these sorts of handsets is AT&T right now, because they have the largest 3G UMTS coverage footprint, and most of the still usable QWERTY handsets made over the years are 3G UMTS handsets.
There are... disadvantages... to going Blackberry, even if the hardware is nice. I used to use a Bold 9900, but finally had to give up on the fool thing.
Like it or not, the mobile industry is rapidly being divided into a caste system. If you want actual buttons and a basic non-smartphone interface, you're stuck with the traditional 12-key dialpad. Even there, though, with the rise of 4G LTE, even the "dumbphones" are starting to be built on Android framework given the nature of how the 4G LTE radio spec operates. Sadly, because of this fact combined with the negligent security update practices that manufacturers have with simple feature phones, going this route gives you the worst of all worlds - no security patches for an OS that gets frequent security patches, no ability to install apps even if you needed something useful, and crappy battery life.
I'll do what I can to steer you in a useful direction, but what you're wanting is rapidly becoming a very tall order. Almost easier to develop and flex the self control muscle to try and break the addiction cycle, sadly... and knowing that there's genuine biological chemical dependency issues mixed into the feedback cycle of these devices, that's similar to telling an alcoholic to stop drinking while living in a house with beer flowing from every spigot and tap.