Just a small cost savings if you want it - I bought these speakers with that exact same amp; they are a bit less expensive than your chosen model, and have been great.
I don't know much about your monitor, but it is IPS which is the best panel type for viewing angles which can be important in an arcade. 1080p is a bit low rez for a 32" display though, so expect some chunky size pixels. In addition, it's a 60hz panel with no adaptive vsync. If you're driving the arcade via a Raspberry Pi, then you won't have adaptive vsync support at the source so missing it on the panel isn't a big deal. However, if you wanted to spring for something more, the monitor might be the place. Moving to a higher resolution display can help with some scanline effects, as well as help overall with pixel sharpness thanks to the increase in ppi. And, if you ever decide to drive the system with something supporting adaptive sync (freesync) like a PC with an AMD APU or GPU, then having Freesync support on the monitor can be very helpful. It can matter for some games - for example, Mortal Kombat 1 and 2 arcade (maybe more) run at 54hz refresh rate, which will introduce a slight judder or stutter when displayed on a 60hz panel; with Freesync, the display will automatically adjust to 54hz.
I went with this one: https://www.amazon.com/gp/product/B0787BRQ2F
I've very much been impressed by it for the arcade. I paired it with these speakers: https://www.amazon.com/gp/product/B001RNNX8K
At first I was worried that they would sound too tinny and lack any impact or whatever, and they didn't sound very good when I tested them just out on the floor. But once I put them in my arcade enclosure ( MDF) they really came alive. I run at like ~15% volume (personal preference so not everyone in the house hears my game) and they are great.