I like my tart yogurt with a LOT of fresh fruit. I hated paying an extra $1.50 at other places to get a small amount of fruit. Now I only go to Yogels where I can load up my yogurt for less than the other local tart yogurt shops.
They have so many rotating flavors. You can check what they are currently offering at: http://yogels.com/content/current-flavors
I recommend the Raspberry Tart and Wild Strawberry. They have a lot of toppings. Plenty of fresh fruit and they even have caramel and fudge.
Check the local papers and coupon books for plenty of 2 for 1 coupons. It usually costs me $4-$5 for a large portion.