If you would be looking for fine dinning i would suggest you the following

Indian
1. Ziya at Oberoi
2. Peshawari at ITC Maratha
3. MasalaKraft at Taj Mahal

Italian
1. Vetro at Oberoi
2. Indigo behind Taj
3. The Table near taj is also worth a try
4. Trattoria at Taj President

Middle East
1. Souk at Taj

Chinese
1. Hakkasan in Bandra
2. China Garden (indian style chinese)
3. Shanghai Club at ITC Grand Central

Thai / Asian
1. Thai Pavillion at Taj President
2. KOH at Intercontinental Marine Drive
3. San Qi at Four Seasons

Drinks and Lounge
1. AER at Four seasons.

Streetside / Mumbai style
1. Bademiya behind Taj
2. Elco in Bandra for Mumbai style charts