Hi Mat,
Your scope should be more than capable of seeing lots of goodies! Especially with the 13mm ethos and powermate. (215X & 538X respectively).
Funny you mention NGC 7662 as I had a look at the Blue Snowball for the first time last night and it looked in size and contrast just like the picture you refer to but without the definition. Just a large bright fuzzy blob (13mm nagler @ 76X). I'll try for higher mag. next time. Your set up should do much better I would expect.
The GRS is definately observable visually. As are the major gaps in the rings of Saturn. And thats just with a 200mm @ 1000mm f/l.
When you get around to DSO's I would suggest getting an eyepiece near 32mm for a wide fov for nebula and glob's.
Good luck and have lots of fun!!
