Thanks for the reply
When i move i do plan to have the projector at its longest throw which i hope will help with pin cushion and thought maybe the panamorph would help me in this regard.
Are you saying the isco II will be ok?
I keep thinking i should just get a big 16.9 screen and not worry about a lens but i would not be getting the height with 2.35:1 films which i think would be a problem for me.
Thanks
The Panamorph will not have any more or less pincushion so I'm not sure what you mean regarding this. If you can setup at a long throw then this will minimise pincushion for any lens you use. Mine is so slight that I can still use a flat electric screen as there is maybe no more than 1/2" pincushion across nearly 10' width. This gets hidden by the screen edge (1/4" over in the corners and 1/4" under in the very middle is my preferance as this isn't noticable from my seated position.
The main issue for you is the size of the image where it hits the back of the lens. This will also depend on how much zoom you need to apply at the projector (ideally near minimum) and the size of the image chip(s) to some degree. Hard to really check without being in the room you plan to use, you could check if the minimum zoom would work OK, but that won't tell you too much if you can't see the image on a screen or wall to see if it's vignetting:
Align the Isco in front of the projector with it set to minimum zoom. Put on a signal such as an all white test pattern, BUT DON'T LOOK DIRECTLY INTO THE LENS.

If you stand to the side (or below if it's shelf mounted like mine) you'll be able to see if the Isco is clipping the sides of the image. If this is OK, you'll be able to increase the projector zoom to see if there comes a point where the image hits the sides of the Isco (if you can project onto a wall then you might see the edges of the image getting cut off in a vignetting effect).
The good thing with the Isco II is that you can adjust the focus ring to optimism the sharpness for your particular throw rather than having to use a compensating front lens as some prism have. These compensating front lenses are designed to work for specific distances so you need to be able to setup at those throw to maximise the sharpness.
I don't have experience of the '480 but if it is a prism lens then I'd take an educated guess that the Isco II would be better. We're in the minority over here so you're unlikely to find someone using the same combination as yourself...hard enough to find another lens user these days.