I had a 2011, and was able to get a new battery under warranty at just under 5 yrs and 60,000 miles.
At the end of 2016 I went looking for a 2017 Leaf with a 30 kWh Battery and was able to find a good deal as Nissan was already talking about the new 2018 coming out with more range.
With the 2017 I could notice/immediately feel I had much more flexibility for my driving patterns with the additional range, and didn’t need to charge as often. The 6 KW charge IS faster, and the DC ChaDeMo was faster also. If you had a DC quick Charger that didn’t cost much for a quick 10-15 minute charge you could add another 40-50 mile range easily up to 80-85%, after that it starts slowing down.
So I think you could possibly find a good deal on a 2016 or 2017 and make do.
However, since the 2019 is coming out with more range, you could likely find a good deal on a 2018 with 150 mile range.
With your experience on your current Leaf it is just a matter of your budget, and whether you like the new technology added to the 2018 or not (like the lane centering, intelligent cruise control, and other collision avoidance features.)
Good luck in your decision.
Separately, don’t know what part of Texas you live, but encourage you to join a local EAA group if close. I understand there is one in Dallas And one in Houston. Good to share information with the other members.
2011 Leaf SL purchased 6-22-2011, sold 1-18-2017 with new battery.
2017 Leaf SV with Premium Package purchased 12-30-2016