Hi Chris,
Welcome to IceInSpace
.
Have a look at this thread, it discusses similar questions to your's.
http://www.iceinspace.com.au/forum/s...d.php?t=137284
First of all, (from my experience) there is nothing wrong with Plossl eps. They are generally good value for money. However, high magnification and small exit pupil can leave you feeling like you are looking through a straw. And with manual tracking, this can be frustrating.
The more expensive high magnification eps have more glass, designed to give a more comfortable and pleasing view, and that is what you are paying for.
But, very high magnification will only yield good views on nights of good seeing, (low humidity, stable atmosphere, etc.).
Best advice is to try to get to a local observing session and try other people's eyepieces in your scope, and talk to their owners.
In my kit, the high mag eps are not used a hell of a lot, but on good nights, they provide some good views of Saturn and Jupiter, and that is mainly all they are used for.