Jon,

I'm probably not going to offer up much "new" in the form of suggestions to try. I second (or at this point in the post, third or fourth) the opinions offered on the Rio Selective Trout lines. I'd also mention the Rio Nymph line as a line worth a look. I've used the "Nymph" line on some pretty frigid days in pursuit of steelhead. While the majority of the techniques I use on the Lake Erie tribs is confined to relatively short line casts I've been really happy with the performance and lack of memory in this line in the coldest conditions (air temps below freezing and water in the low 40's F range).

You've got a bunch of good recommendations so far, sounds like you've got your work cut out for you. Isn't it nice to have choices!