I'm looking for a permium(ish)7(ish) mm ep to use in my MN61 (900/150).
I'm mostly interested in deep sky.

I'm considering:
7mm T1 Nag
7mm Pentax XL
5-7mm Speers-Waler

I'm well covered in the 10mm+ range, but find my 4mm and 6mm Kasai Orthos
rather limited in FOW and eye relief for comfort.

Any opinions, anything else I should be considering.

Thanks in advance