Cote Sud Bistro?
Today's Groupon is for a place in Hillcrest called Cote Sud Bistro, but I've never heard of it before. Yelp gives 4.5 stars, and the menu looks like a good traditional French bistro with surprisingly low prices. Anybody been? Would love a well-priced French bistro.
They're new, so yelp is all you've got to go on for now. They're right next to Pho 5th Avenue which has two votes here as best Pho in San Diego by far (and also the most expensive lol).
Opera in Sorrento Valley is a good authentic French bistro at reasonable prices. They'd be above average in Paris (and also cheap), but in Mira Mesa they're easily number one. =)
At a slightly higher price point Cafe Chloe in downtown is superb.