For a base station, the gold is in the antennas.
$$ spent on antenna upgrades are more rewarding if you are not into just raw horsepower...... and you have some room.
And antennas are as legal as ice cream.
2C1 said it well, the little KL amps are over rated, but if you just treat them with a little care and stick a fan to them they are ok.
73
Jeff