Whatever you get, make sure it is very breathable with adequate venting, pit zips, fabric, etc. I've got softshells, rain jackets and vests that fit the bill for the conditions you describe.

- My Pearl Izumi and Louis Garneau vests are great for blocking wind on your chest, in combination with a long-sleeve jersey, and ventilate well. I am comfortable with a LS jersey and vest in temps down to about 40 or upper 30s if temps are warming up.
- Gore Phantom is a very warm softshell that vents well and has removable sleeves if temps warm up a lot. Front of jacket and arms are made with windblock fabric and the back a very breathable material.
- Showers Pass Elite 2.1 is a rain jacket but is so versatile and breathable that it's my main cycling jacket in winter, whether or raining or not. The fabric throughout is very breathable, and it also has large pit zips, back vents, and adjustable sleeve cuffs. If it rains, it's waterproof, and you can buy an optional removable hood. Comes in a range of colors. Save lots of money by buying on line.
- Showers Pass Skyline is a breathable softshell jersey/jacket with pit zips. Not as breathable as the SP Elite, but more so than the Gore Phantom. Very water resistant and will keep you dry unless it's pouring or riding a long time in lighter rain. On sale right now at SP website. I would recommend any of the SP gear, from my experiences with the Elite and Skyline.