For those sectors, most jets will also be landing weight limited.
Of course, if the destination runway is gravel, the 146 is the the only game in town if you must have a jet.
However the baby of the fleet, the 100 series, is probably the optimum for the operation you describe, especially with such high ambient temperatures. There is no point in having 85 seats if you can only carry 65.
The 200 is a bit of a dog and the 300 with 502 engines is useless in the heat.