I wear wool year-round: socks, baselayers, and jerseys. One caveat: I've found that my pocketed jerseys tend to sag irritatingly when I cram their pockets full of junk (e.g. cell phone, cleat covers, snacks, and so on). I now compensate with a bigger seat bag (the smallest Gilles Berthoud model). I also look for pocketless jerseys, whose "cleaner" look I appreciate.

Rivendell sells some nice stuff, BTW. It's all well made, if not trendoid-stylish. There's cheaper stuff to be found, though.