I would say you will be most comfortable in fabrics consisting of a polyester/lycra blend, or coolmax "technology." Basically, anything that will wick sweat away from your body and not hold onto it. Your bra is just as important as your other layers, so don't skimp on the performance of that fabric, especially if you sweat like I do! REI has a great line of OXT clothing, both for summer, fall and winter conditions (the latter of which will be most appropriate for our lovely June weather).
Regarding layering, I am probably the worst person to respond out of our group because I run consistently colder than most... hence the gloves, jacket and running tights all season thus far. A safe bet would probably be a tshirt and longer sleeved shirt over top (or windbreaker if Palmer conditions are as usual). Figure out how long it takes you to warm up, and how many layers you wear when you're halfway in to your run and most comfortable - you can always strip down if you don't mind tying clothing around your waist.
I have found that Sports Authority has a greater selection of running fabrics at all ends of the pricing spectrum. Good luck!