The Satsumas, kumquats, calamondins would need to be mature trees in order to survive the winter of not less than 15 deg F outdoors. So you will have to protect them first until they are big enough to be left alone in the ground.
Satsumas tastes better than Changsa, but if you want less risk, this would be my recommendations (descriptions are not my own but from sources indicated below, I am ASSUMING that their descriptions are true or close to what is true, these are from sellers, so they tend to hype them up):
taken from:
http://www.worldwideplants.com/hardy_citrus.htm
For the sweet taste or nearly sweet taste:
Hardy Tangerine - Cuttings from this plant also come from South Carolina and has survived 0 degrees and with no damage whatsoever. This definitely worth trying in a warmer/protected zone 7b climate. A sure winner in a non protected zone 8 climate!!
For the Lemon taste or close to it:
Hardy Citrandarin (Citrus Reticulata "changsha" x Poncirus Trifoliata) - The hardiest citrus hybrid available! This is a cross between a very hardy mandarin variety called 'Changsha' and a citrus relative called Poncirus Trifoliata. Both are extemely hardy with Poncirus being the hardiest parent. This is without a doubt the hardiest available citrus and is zone hardy up to protected USDA zone 6b-7a !! Cintrandarins have beautiful foliage and fruit. The fruit has been best described as looking like a tangerine / mandarine with deep orange color, and flavor closely resembling that of a true lemon.
For simply interesting taste:
Hardy Citrange - A hybrid citrus plant which is a cross between a sweet orange and the hardy citrus relative called Poncirus Trifoliata. Poncirus Trifoliata trees have been planted and thrive in very cold areas up to usda zone 5. Citranges are hardy up to USDA zone 7 and are few plants are growing in the Washington D.C. area. The fruit has a complex flavor but could be described more closely to a semi sweet orange.
Now, these recommendations are based on the assumption that those descriptions are true. Then there is that issue about the tastes, they could greatly vary where planted, except if the citruses are naturally sour.
However, if you are willing to work hard prtoecting them the first few years, for the sweet orange type flavor, I would try the Owari Frost Satsuma. Mine came from a stock that have survived during the record breaking 12 deg F in our area.
Here's the rest of the info from different sources:
http://www.justfruitsandexotics.com/Citrus.htm
Calamondin 15 degrees F
Chinnotto Orange 10 degrees F
Changsha Tangerine 8 degrees F
Meiwa Kumquat 15 degrees F
Nagami Kumquat 15 degrees F
Nippon Orangequat 15 degrees F
Ichang Lemon 10 degrees F
Tiwanica Lemon 10 degrees F
U.S. 119 Orange 10 degrees F
Rangpur Lime 15 degrees F
http://www.floridata.com/ref/C/citr_ret.cfm
http://zzyx.ucsc.edu/casfs/gardenideas/citrus.html
http://www.hort.purdue.edu/newcrop/morton/calamondin.html 
