Hi Meru,
The 22T4 is great for extended objects or just scanning around, excellent sharpness and contrast. I haven't felt the need for the Nagler 26 or 31 as the 22 Nagler's wide field is just right for my needs. The range I have picked could easily be different, maybe substituting Pentaxes at the shorter end or Vixen LVW's but I'm happy with what I have. They cover all the DSO's I am looking for. Weight is a consideration also. I have an old speaker magnet on the bottom of the tube to compensate for the weight of the 22 and 17. The 26 or 31 really are getting a bit heavy. I haven't looked through an Ethos or Delos, but check the weight as well. Some find the Ethos extra wide field is not for them as the eye hunts around the FOV. The Delos with its narrower FOV might be worth considering. I find the 82 degrees of the Naglers is plenty. I would recommend going to a star party if possible before shelling out $$$'s. I have looked through the Pentax 10 XW and the field (about 65 or 68 degrees I think) is ideally suited to the eye and is preferred by many. They are a bit hard to find these days but are a great eyepiece. Much smaller and lighter than the heavier Televue products. There are plenty of threads on this site about eyepiece selections by observers with much more experience and technical knowledge then me. I would recommend scanning through these threads before spending money. I like to read John Bambury's thoughts on eyepieces. This is just one recent thread:
http://www.iceinspace.com.au/forum/s...ad.php?t=85557
You don't have to stick to the same manufacturer and starting with a couple of eyepieces is sensible. At the end of the day eyepiece selection is a very personal thing and trying before you buy is much to be recommended. Good luck with your selection. Paul.