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To find out about the JackKnife sets look here
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As far as slim line or regular, it's really up to you. The slim lines are used in Europe where the keyways are tight but will work just as well in the US. You said you travel a lot but didn't mention where to so not sure which would be better for you. If you can afford it, maybe get a regular pick set with handles and then choose a couple of slim picks to add to the set. I mentioned getting the picks with handles only b/c I prefer them over non-handled ones. The choice is yours. I believe you can actually buy a set that contains both regular and slim line picks.
