I think that if you want to stay below $300, you can't beat the
PL53. It has a quality (if small and inexpensive) conical burr set and the ergonomics and build quality are pretty good for this price point. I believe the Ascaso i2 has the same burrs, but that Bella Barista review didn't make it sound like the ergonomics were as good. Although the reviewer also seemed biased against the i2 from the start, so I'm not sure how much faith to put in that judgement.
I've used the Vario as well, and it seems like it's a little bit better in terms of both grind and ergonomics than then PL53. If I were deciding between the two today, it would be a close call, but I'd probably end up going with the Vario. Although you really can't go wrong with either one.