Basically, the 6s/7/8 Plus models' updated equivalents would be, at least, the Phone 11 or 12.
The 8 Plus's 5.5" screen and bezels make it somewhat larger than it appears. The 5.4" screens are stretched out and without bezels on the 11/12 models.
If one has more money to spend, one could upgrade to one of the Pro 6.1" screen models.