I recently bought my first pair of cycling capris - wasn't sure I'd like them much but was looking for something in between my shorts and full winter tights. I'm using them quite a bit and don't feel overheated at all. They don't have really thick padding, and based on the length they might work well as full-length tights for you. Check out REI's Novarra Mezzos. It's member coupon time at the moment, so they'd be reasonably priced.

I don't commute when the morning temp is below about 45 because my asthma kicks in with the colder temps. When I do ride in the high 40s to mid 50s, a headband to cover my ears is important. Also some light shoe covers to block the wind from coming through the vents are nice to have, too. I have these LG ones : http://http://www.louisgarneau.com/us-en/product/305541/1083075/Shoe_Covers/T-COVER_SHOE_COVER