Catch 35 recently opened in Naperville, and I've heard nothing but good things
35 S Washington, Naperville
630-717-3500
Chin's 34th St Fishery
3011 W Ogden, Lisle
630-637-1777
Hugo's Frog Bar is very nice with a fun atmosphere
55 South Main, Naperville
630-548-3764
You might try the Francesca restaurants (there's one in St. Charles, 1 in downtown Naperville, and a new on in Naperville on Route 59 and maybe 95th Street).
Also, Tribella Grill in Batavia, which I really like
1900 Mill Street, Batavia
630-406-9696