Well, it depends on what size flies you want to toss and what size water you want to fish. I assume that since you are on the Island, you aren't going to be hitting the T. or the Skeena on a regular basis, so a small spey or a switch rod should be fine to cover most medium sized island streams.
A 7wt switch rod is not the same as a long 7wt single hander and will want to toss heavier lines, same deal as with spey rods, but shorter head length to account for the shorter rod lenght - everything must remain proportional... Basically, they have much different grain windows than single handers. A 7wt single hander will want to toss ~177-193 grains, while a 7wt switch rod may want to toss ~ 300-500 grains. Your research should have revealed this...
Single hander grain chart and line explanations http://www.flyfishusa.com/lines/choose-line-home.html
Tapers and actions are unique to the rod, for example, the Beulah classic switch rods are med-fast, so a relatively deep flex, and the platinum switches are apparently a deeper flex (med action), but other switch rods are faster and can be more of a tip flex (Orvis comes to mind). I hope this answers your question... I dont really understand why you have this question actually, the info you ask about is basically what is listed on all manufacturer websites - grain window/line choice & action.
See examples from Beulah 7/8 classic switch and 7 platinum switch.
http://www.beulahflyrods.com/product...hrods7-8wt.php
http://www.beulahflyrods.com/product...tchrods7wt.php
Orvis example:
http://www.orvis.com/store/product_d...ubcat_id=17952
TFO example:
http://www.templeforkflyrods.com/pro...ds/switch.html
Also, don't expect this to be a quick fix. Learning spey/switch casting has it's own learning curve. If you are competent with a single hander, you have a head start, but expect at least a couple days to get comfortable, and a season or so to get good with the new style.
Basically, you should just get out to a spey clave or a shop and give one of these rods a try.



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