I'm the queen of peach.Revlon Colorburst Lipstick in Peach, it has awesome, smooth color payoff. It's a little soft for my taste but excellent for the price. You can find it pretty much anywhere. Ravishing lipstick from Mac is a pretty color, especially for the summer. Nars lipstick in Love Devotion is a pretty summery peach tone. My favorite used to be Victoria's Secret lipstick in shh, but I think they discontinued it. They are all good tho =)
I'm going to give you the links to a couple of different brands and shades to look at, but both are high quality.
A very good brand of lipstick is Bite. It has all kinds of antioxidants and vitamins in its ingredients. Bite Lipstick comes in a darker shade of peach called Rose which is a peachy-pink that you can find at: http://www.sephora.com/browse/product.jhtml?id=P28
A nice peachy shade for summer is Sephora Collection Maniac Long Wearing Matte Lipstick (and it really is long wearing) in the shade Mat 07. You can find it here: http://www.sephora.com/browse/product.jhtml?id=P18
I hope this helps you.
NARS Barbarella is very peachy toned, so I second that response, and NARS Love Devotion is a really pretty, sheer, glowing coral. It may look like a scary orange crayon in the tube, but on me, it's more wearable than Barbarella (I have cooler undertones). You might also like the Buxom Big & Healthy Lip Stick in Nantucket -- that's definitely more peachy than pink.
YSL's rouge volupte lipstick in #13 Peach Passion: http://www.sephora.com/browse/product.jhtml?id=P21
Clinique Butter Shine lipstick in Ambrosia: http://www.sephora.com/browse/product.jhtml?id=P12
MAC: Creme d' Nude, Freckletone, Ravishing.
Hope that helps!