Catholic Psalms Study in English

I don't think the version of Logos is going to make any difference to you, but having the right resources certainly could. Here are some resources I've found useful which focus mostly on the English text:

One work that comes to mind immediately is Derek Kidner's two-volume commentary on the Psalms in the Tyndale Old Testament Commentary series (Evangelical). It is a non-technical commentary that nonetheless has been consistently ranked among the best on the Psalms for many years (published in 1981). It is inexpensive, and also happens to be on sale right now.

An interesting nontechnical modern (2009, U. Notre Dame) Catholic work that's available in Logos is Benedictine Fr. Laurence Kriegshauser's Praying the Psalms in Christ. This work treats each Psalm in order, providing an amazing number of cross references - which are super easy to use in Logos.

Another useful modern (2001, Emmaus Road) Catholic work on the Psalms is Michael Barber's Singing in the Reign: The Psalms and the Liturgy of God’s Kingdom. This is a fairly short book that approaches the Psalms thematically, and spends the last third of the book covering the restoration of the Kingdom under Christ.

There were several good studies of the Psalms published in English by Catholics in the first half of the 20th century, and Logos has a couple of them: by McSwiney, and by Boylan. These are only available in a set. They are somewhat technical, and translate/deal with the Vulgate.

Among Catholic treatments of the Psalms, the six-volume collection of Saint Augustine's sermons is notable. Logos has an older "Oxford movement" era translation available for pretty short money, but also has a more modern translation available at a premium price. If you have the Philip Schaff Nicene and Post Nicene Fathers set, you already have an abridged version of the Oxford translation in volume 1.8 of NPNF.

Saint Alphonsus de Liguori wrote a very highly regarded treatise on the Psalms and Canticles of the Divine Office which is quite usable as a commentary on Psalms in Logos/Verbum, seeing as it is indexed on Bible refs, and will sync fine to any Bible, Psalter, etc.

One very interesting topical work from Evangelical scholar Gordon Wenham that might be of interest is Psalms as Torah: Reading Biblical Song Ethically.

Most important would be helpful translation of the Psalms. One of my favorites is The Psalter, or Psalms of David: In English Verse, by mid-19th century Oxford don John Keble. It's a bit free, but terrific. The other Psalter I'd recommend at this time is the original Grail Psalter, this being the version currently used by English-speaking Catholics to pray the Liturgy of the Hours daily. Also rather free, but great for recitation/praying.

It's hard to find commentary on the Vulgate Psalms that considers Latin, Greek, and Hebrew. I've enjoyed having this one.

I went over this product page several times, but didn't see the value. Now, I do ... thanks! My understanding (poor) is the Psalter was the earlest, beyond basic teachings (long before a canon).