Hi, I would like to find a suitable laptop for my dad.

Requirements:
Price: preferably around 2.5k - 3k (a bit more is ok)
weight: doesn't matter, but better if not too heavy
brand: doesn't want HP, Acer or Toshiba, others are ok
specs: at least i5, 4 - 8GB RAM, Screen > 15", have port to connect to another monitor
Usage: use for stock trading almost all day, casual games, web browsing

Prefer those that can disperse heat well, good build quality and good keyboard.
Thanks in advance!