All good words have already been spoken here, I'll add just a
few other thoughts, There isn't the perfect all around 1 rod set-up.
Thats why alot of us spey guys/junkies have several rods for different situations/fisheries.
Is there a shop close by that has access to water nearby so you can try
them out before you buy? Sometimes the staff has rods to try out with
them in a class style format before you buy. Grass casting is NOT truly
representative of the rods capabilities or shortcomings, If you are a steelheader, the rods ability
to lift a sink tip with a large fly and break the TENSION OF THE WATER, NOT THE GRASS
at the start of every cast is paramount. All spey casts have some form of a anchor point
and keeping the rod in the correct amount of tension during the casting process
is what makes or breaks the cast. nrthcsteel hit the nail square on
about rod/line combinations, Ask yourself "how am I going to use this rod?"
heavy sink tips/ large flies or floating lines/leaders/smaller flies
trout or steelhead, big water/ little water etc. and keep asking the questions as they come up.
I hope that you are able to take some time, visit some good shops and as was
already suggested visit the speypages, there is alot of info there.
I hope that this is helpful,