check out Eastern Mountain Sports at EMS.com. 100% satisfaction gauranteed on anything you buy. The thunderhead parka is a great jacket. You could also go with the Wildcat Ridge Jacket that also allows for a liner (fleece, softshell, etc.) to zip into the inside for warmth during colder days. Plus, you can also find some good geocaching tools at EMS. Hope this helps. I love EMS gear, it's great. They also sell the name brand stuff.
There is also another jacket, very inexpensive, not sold at EMS. The RED LEDGE jacket and pants. It is treated with a waterproof membrane. Great service from that company too. Can usually find at an outdoor shop.
And don't forget the waterproof footwear. Nothing worse than cold, wet feet.