The Island of NL. has plenty of small to med. size rivers and this seems to be the size of alot of rivers your going to fish, If you ever get into atlantic salmon odds are you will not be useing tips. the grand spey has a 100' head, Loading and learning how to manage line properly on that thing is not going to make spey fishing a veary nice experience for you.
"JD" is right that stripping line for Pike is not quite suted to spey fishing, I've caught pike on a spey rod, I've caught mackerel off the coast of Labrador!
on a spey rod, it's fun, But rather go about doing so with my single hander.
If money is not so much an issue, go with the "windcutter" or a line with a shorter head length, Easy loading, and would aid in propelling those large pike flys, A great line to learn to cast with. But if money becomes an issue and your not willing to dish out another $100 bucks on a new line to try out
Go with a MID. head length line (60-70') if you want to try spey casting for everything
. If I hade one spey line for the rest of my life it would be a 60-70' head or "Midspey",Loads easy, handels tips, propels large flys, I started out on a midspey and fished 45-55 feet of line but now when the need asises i'll shoot 100'+, it is your "All Around" spey line. AS for your grandspey, I would think about sending that one back or selling/tradeing it for now,just my .02.
Best of luck with it all, Hope it works out for you!