Have been happily using Amibroker on two 27" monitors on a Apple Mac mini. CPU load runs at approx. 7%. The 2014 model natively supports two monitors (2560 x 1440 in my setup at the moment). I like these small computers - they do the job and they have no noise. And when travelling I can just put the computer in a small bag and use a hotel's TV with HDMI. Due to also having OS X I can easily restore within a short timeframe - in other words I've got backup build in. This after having had numerous laptops - I no longer am prepared to put up with small screens and having to squint.
IF you are asking that advice in something like 2019 still I can recommend you to get something like newest Ryzen 5 3600 or so with lot of RAM and good motherboard and really fast SSD and you would be good to go for a lot of times really. Be sure please.
getting a good desktop is easy... with a good laptop you really need to pay attention to many things.. don't get 13".. cpus are not powerful enough.. get 15" or 17".. if you buy a gaming you need to see that the fans are not going to annoy you.. if you get a slim notebook then you need to check that the thermals are ok for sustained loads.. of course it really depends on your charting/trading software as well... something like sierra chart i'm guessing an ultraportable 13" would be fine. Also you need to see that there will be enough ram for your needs..
Wow. Reviving a thread which was dead for 4.5 years. People really have too much free time on their hands these days.