Here is a site that will allow you to select and compare various brands and models.
I use an Asus RT-AC3100 and am very pleased with its features and performance.
One feature that really is helpful to those of us with data caps is its ability to track data usage per device.
If the old one were to die right now and needed a quick replacement, I'd be looking at the Asus RT-AC3100 or RT-AC1900P since those are available for pickup in an hour at the local big box retailer and have the features I need (or can be expanded to get them).
I personally do NOT recommend the modem/router combo, it is not a true dual band router so you have to leave it in the 2g mode because not all devices can "see" the 5g.