I'm thinking of embarking on a regular work commute that will take me from Champaign, IL to Chicago with a couple of train changes and a short 2-3 mile ride at the end. The end result is about 3.5 hours by train and a few miles of actual riding.
I have a Giant Halfway. It's a little on the heavier side of things, but overall it's a pretty nice bike. I won't be carrying it too much so the weight isn't much of an issue. My main concern with this potential commute is weather.
Pretty much everything I wear outdoors is by Paramo now. They've taken the mountain rescue world by storm and if it's good enough for them... http://www.paramo.co.uk Other than that I have an Endura 'breathableish' top that I use as it's rather a fetching emergency service yellow. My other choice is a Paramo jacket - far far far better than Goretex for breathability. (look for Paramo or Event fabric IMHO...) legs - www.rainlegs.co.uk are a fun idea that I see used. Failing that I have some paramo windproof trousers that are TX treated and cope very well - or I wear shorts and don't care
I wear the O2 hooded jacket and like it alot, but would not use the pants because I think the seat would not hold up. Instead I'd probably wear something like the golite reed pants if I needed rain pants.
Get a size larger for pants, and the full zip. I wear a L jacket, which is more than adequate (6', 210#) but got the L pants which are snug wearing jeans, but probably fine with slacks. But like I said, the full zip is much more convenient albeit a bit more expensive. Can get a little sweaty so I usually wear a moisture wicking shirt and put on dress shirt at work.