That CPU comes with a cooler so you don't need that.

At 2TB SSD, you should compare to the $1350 steam machine instead.

The GPU isn't exactly equivalent. Gamers Nexus puts it closer to RX6600 performance. But that ignores the RDNA3 improvements so I don't really have a good comparison for that.

They did announce SteamOS for general computers, so I don't expect game support to be too different.