This is coming in months after you posted so don't know how helpful it is. Generally, these planetary EPs have a relatively narrow FOV, which is all you need when viewing the planets (or even the moon). The BO/TMB is much better than the plossls because of the better eye relief. However, it's my opinion that you'll want a wider FOV for DSOs. Take a look at the Baader Hyperion line for DSO's, perhaps a 21 or 24.