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What apparent field of view are you after? 50deg, 60deg, 82deg, 100deg?
The Nagler Zoom is a very fine eyepiece and the ability to dial in any focal length between 3 & 6mm is a treat, (2-4mm Nagler Zoom also available). The AFOV stays at 50deg and the eyepiece is parfocal across the range. Eye relief is short but quite useable for non eyeglass wearers.
If you need extra eye relief, consider the Radian series available in 3, 4, 5, 6, 8 and more upwards. The Radians give 60deg AFOV and 20mm eye relief.
If you want wider AFOV then the Nagler T6 are available in 2.5, 3.5, 5, 7, and more upwards. The Ethos with a 100deg AFOV currently goes down to 6mm but I would think a 4mm may be available in the future.
You could also consider both 2x & 3x Tele Vue Barlows which would give you 3.3mm, 5mm, 6.7mm, 10mm, 20mm. Yes you double up one size 10mm but for a lot less cost than the Nagler Zoom you will get three new focal lengths you didn't have before. However, the quality of the final image will depend on how good your 10 & 20mm eyepieces are. The Nagler Zoom is built on quality and basically gives you a premium eyepiece with inbuilt variable Barlow. There are click stops at 3, 4, 5 & 6mm but in between powers can be easily dialed.
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