you got the right guy giving you the right answer in the very first post, dude!
Bear...fortunately, the major rod manufacturers have intelligently posted recommended line weights and sometimes specific line recommendations on their websites, which is pretty cool, like Steve said.
Line manufacturers also often publish line recommendation charts to help match their lines with specific rods. This helps make line selection much easier.
for your last question, you need to be especially careful when looking at switch length rods from European manufacturers. Some of them have 11-12' rods called sea trout rods, which have a lower grip like a switcher but are lined according to SH weights.
Captain of the Jameson Godawful casting team
Sportkilt Sponsored Middle Aged "athlete"