If you do pick one to seam, I would advise you to AVOID MOHAIR! :rollseyes: I made my first sweater in mohair and had to seam it. I haven't made a seamed sweater since...or a seamed ANYTHING for that matter.
My second sweater was Topsecret from Knitty, which is in the round and bottom up. I LOVED it and it was quick to work since it was bulky yarn.
Tubey is done in worsted and is not difficult at all except for the picking up stitches to start the body. That was a real pain in the a**. I don't know if you've checked out the Knit Along board, but there's a thread for Tubey that's got some more information on it.