1.
The Unabbreviated Horologion published
by Holy Trinity Monastery in Jordanville, New York. In my opinion
this is the best one available, and certainly those following Russian
practice would be advised to use this one.
2.
The Great Horologion published
by Holy Transfiguration Monastery. For those following Byzantine
practice, this is an option. Also, even those following Russian
practice will find it a useful reference, since it contains Synaxarion
readings for each day of the year, and also the troparia and kontakia
appointed for each day.
3.
The Liturgikon,
by Bishop Basil of the Antiochian Archdiocese is also often used as an
Horologion, and also follows Byzantine practice. The text is
primarily designed for use by clergy.