I would like to ask Southrons (if you don’t know what it means, you aren’t one) if the following behavior would be a serious breach of etiquette:
Instead of serving sweet tea, would it be acceptable to serve unsweetened tea along with a selection of syrups that include simple syrup (sugar alone), mint syrup, and lemon syrup?
While the selection of flavored syrups would be a nice gesture, serving tea that is not already sweet enough to have dentists racing in your direction from several surrounding counties would be sufficient grounds to have you pummeled into unconsciousness with a fistful of ramps.
Zenster is–as is usual in such matters–quite correct. Syrups can provide additional flavoring, but will not properly sweeten the tea. If you wish to provide flavored syrups in addition to sugaring the tea immediately after brewing, they should be relatively light (i.e. they should pour, rather than requiring a spoon).
We need a snaggle-toothed smilie. 
Obviously, I was unaware of the level of sweetness required for true Sweetea. I shall have to remedy this ignorance. Fortunately, my mother has moved to North Carolina (outside the Tech Triangle), so a visit to her new home will allow me to visit some local establishments and improve my culinary education.
You can, if you like, offer both sweet tea and unsweetened tea. There are some people who like unsweetened tea.
Unsweetened tea with sugar or sugar syrup added later is just not the same as properly made sweet tea. The sugar has to be mixed in while the tea is still hot, so more sugar can be absorbed. Good sweet tea needs to be super saturated with sugar.
And I beseech you: never, never make tea from a mix. Promise me! (Shudders just thinking about it.)
Have fun with your impending culinary eduction. lesa’s suggestion to serve both sweet and unsweetend tea is a good one.
Is it proper to serve “sun tea?”
First, you have to get the terminology right:
“Tea” = sweet tea
“Unsweet” = tea before the sugar is added (what northerners order after they’ve moved here)
“half-n-half” = (what northerners order after they’ve lived here awhile)
You should just fix both. Please don’t sully the tea with the flavored syrups unless you plan to call the concoction something other than Tea.
Also, if you have invited alot of people don’t be surprised if only a few show up, even though everyone said they’d be there.
Hey! Tolkien threads are supposed to go in Cafe Society! 
As a true born n bred Southerner from Arkansas, I’d like to contribute my .02:
Sweet tea is dandy and popular, but unsweet tea is almost always available. I prefer unsweet tea myself, or to just add sugar myself. My mom is the same way. Many friends and family members prefer unsweet tea. Not a Yankee among them. This is yet another overhyped stereotype…
Serve sweet tea, but have unsweet tea readily available, just in case. The syrups are a nice gestures, but just plain weird. You can, however, place mint and lemon wedges on a small plate, so that guests may add as they like. It is also quite pretty.
We constantly get positive comments on the tea here at the Lyllyan House, and make it by the gallon daily. The standard recipe is 3 large family size tea bags per gallon, with 2 cups of sugar. It must be made with boiling water poured over the tea bages, and then left to steep for a few minutes. Never, ever, boil the teabags, as this makes the tea bitter.
Sun Tea was a fad here in the South quite a few years ago, and is now considered passe’. Sun tea is never quite strong enough.
Have Tea, Unsweetened Tea, and sugar available.
For the guests: complements on the Teas are accepted, but never say the tea is too sweet or not sweet enough. Just rectify the situation with your refill.
Hosts: make sure you have extra ice and fresh mint sprigs available. (some people like lemon wedges, too)
I agree with those who suggest making both tea and and unsweet tea available. However, if it’s your home, you may serve whatever you like, and your guests should not complain.
Lemon is a neccesity.
It’s not tea without a lemon slice on the rim of the glass and another at the bottom.