I agree with Wavy about the eye relief. Plossls were the bees knees of EPs thirty years ago. Today there are much better designs that leave plossls dead in the water, and are not too expensive either. They employ newer optical designs and newer glass types.
But, be aware that oils ain't oils when it comes to all EPs. Some perform better than others depending on the optical design of the scope they are used in. AND, within an EP model range, there can be a difference in performance.
Like Colin, the TMB Planetary Type II range perform very well in Newtonians. But the 6mm isn't the strongest performer. They can be had cheaply too new for around $70, and on eBay of all places. The 9mm is one of my favourite EPs in my kit.
The Baader Hyperions are an optical mismatch with Newtonians,
except for the 5mm. I've had many Hyperions on the strength of reading many reviews, but what I hadn't picked up on was all the positive reviews had these EPs being used in SCTs and Maks. In these scopes these EPs are excellent. But like I said, only the 5mm is good in Newtonians. The only Hyperion in my kit now is the 5mm. The nice thing of the Hyperions is there excellent eye relief, big eye lens, and a generous 68 degree AFOV.
The Orion Stratus range is the exact same EP as the Hyperions. The performance of the 5mm will be just as good. There is a
5mm Stratus up for grabs in the classifieds too for $90.
The Vixen LVWs are all fabulous in Newtonians, but they are all much more expensive than the TMBs and the Hyperions. Other EP designs are excellent in Newtonians, but they too are significantly more expensive than plossls.
Mental.