DG1 sounds ideal for this but you can't buy it.
Hopefully there's some way to get it when it's released
According to videocardbenchmark.net Intel Xe graphics are about 20% faster than the GT1030, that currently leads in the world of single slot low power GPUs
I don't care if it's 20% slower than the GT1030 if I can browse the web in firefox under KDE with default settings! Since I replace my graphics card less often than I replace my CPU, I would pay a premium for such a device.