200μg is not really low, it's pretty much in the range for a "standard" dose. I personally prefer anywhere between 125-250μg for a worthwhile trip, including ego death, any time I have taken over 250μg it has required some preparation.

300-500μg range goes into way over a normal trip, I've only once taken 500+μg (and I consider myself experienced with hallucinogens) and the experience was borderline overwhelming, I had a good trip but wouldn't ever recommend it to anyone that isn't very experienced and knows very well what they are getting into.