I agree with Supernatural and urbanomad about Pane e Vino. Pane e Vino is not crazy expensive. Check out some pictures I took while I was there - http://www.thethirstypig.com/2011/03/...
Also, the original De Marco's is quite good, as well.
1/F, Golden Bridge Garden, 103 Dong Zhu'anbang Lu, near Jiangsu Lu, Shanghai