Hi Pete,
Do you like white peaches because of their classic subacid flavor? Some white peach winners pack a bit of acid so watch out on that in case.
I believe your planting spot is not that different from mine in Virginia. With the exception of disease burden secondary to humidity, we are in prime peach growing land. Are you willing to spray with some light organic sprays? So far, I have only had some mild powdery mildew that neem oil controlled immediately. High density planting should be avoided in our area for peaches and other good plant hygiene precautions are warranted to decrease disease burden (max sun, max spacing, proper pruning letting sun hit the center of tree, ID'ing diseases early on, etc.)
Belle of Georgia is the classic white peach grown around here that has the classic subacid flavor and has good disease resistance. Although any tree-ripened peach will taste 2x as good as a store bought one, it is not tops for flavor. It also has bad fruit drop--as soon as they ripen, they all fall to the ground if left unpicked. Not a biggie though, still the classic tree due to disease resistance.
Redhaven is its equivalent for classic yellow peach with disease resistance--again not tops for flavor but tops for ease of growing and still a decent peach.
General rule of thumb with peaches is the later the season the better the flavor. Gold Dust and Harrow Diamond are the only good disease resistance and good flavor early varieties.
Winblo is Desmond Layne's (Clemson) favorite peach--a yellow one with exceptional flavor and good disease resistance--this variety is tougher to find.
(he passes out after eating it--I guess a 12 on Dennis's scoring system?)
Carolina Gold comes from the same NC program (peaches for our area basically top flavor with top disease resistance) however its fruit are small. Again a tougher one to find.
The Artic series for nectarines is supposed to be fantastic, but nectarines don't necessarily cooperate quite as well with our climate. Saturn also gets diseased in a hurry here.
Have you ever seen Scott's peach report on GardenWeb? He is the true organic peach guru for the mid-Atlantic and constantly posting updates. He grows varieties nobody else has access to. We all look forward to his reports. You might want to peruse through the last few years of his reports, here's 2012...although his favorite whites are near impossible to find. Also there are white/red flesh peaches with incredible flavor--pack more acid.
http://forums2.gardenweb.com/forums/load/fruit/msg090928237397.html
Some of the good peaches are only great on the west coat, Rio Oso for example can get disease quick here. My Indian Free (red flesh) gets a lot of peach curl disease.
Summary: Belle of Georgia (white) and Redhaven (yellow) for easy crop, good taste, and readily available plants. If you want a champion get a Winblo for our area best combo of classic yellow flavor and disease resistance.