Hi This is my first "posting", I would just like to comment on your posting for it is a subject that really has a lot of hidden unexpected outcomes.
I have been editing images and video on a computer since 1997 and it was all so simple on an analogue screen such as your Sony. Then came the digital age and with it problems that probably only video editors will notice AND NOT ACCEPT AND OR WILL COMPLAIN ABOUT with no resolution at all.
Talking digital images: in general the aspect ratio of the digital image as generated in a stills camera is 4:3 3:2 or perhpas 16:9 and in the past we would have viewed these successfully on a 4:3 computer screen via some software that was probably designed for use with a 4:3 computer screen and/or television.
The flat screen that came with the digital revolution these days is provided in anything else but a 4:3 aspect ratio.
A 16:9 wide screen monitor will most likely generate viewed images that are 33% stretched sideways. Cars will have egg shaped wheels, faces will be stretched and ladies will look somewhat broader UNLESS the software or your system is capable of producing a 4:3 image with black bands down each side. I hate it.
I tried to find a 4:3 flat screen when my analogue Sony quit and the sales person looked sideways at me. His solution was what turned out to be a 5:4 aspect ratio screen by Samsung and what that does in general is to stretch the 4:3 image by about 6% vertically. I hate that also but it is better than a 16:9 monitor that stretches such images 33% sideways.
The computer video card will probably have a variety of resolutions, 1024 x 768, 1280 x 960 are each 4:3 but when the Microsoft logic takes over the result is stretched images.
My Samsung screen documentation suggests that best outcomes are achieved at a video card resolution of 1280 x 1024 (5:4) so you can see that a normal 4:3 image should have black bands top and bottom. They do not. So stretch is the name of the game in the digital world of today, its appalling and I blame Microsoft and its generally faulty logic.
You may have to work with windows that you drag the shape to be 4:3 in the working area and then at least your DSLR images will have "circles as circles" and not "eggs".
My own view of flat monitor screens is the video card is more likely to control what you see, so almost any flat screen will do the job but finding one that will, in conjunction with software, produce circles as circles is quite impossible so one eventually accepts that there is never going to be a "round" solution.
Cheers, this is my web site with 50 years of photography and video archived.
http://users.chariot.net.au/~rossmcl/index.html