We've just returned from CPT and following are the restaurants we dined at:
95 Keerom: Very good Italian, went there last year too and certainly worth going again.
Aubergine: Very, very good indeed. Went first on Sunday evening, and then again on Tuesday as Jardine let us down (well, not entirely, but they did not advise us that they were running a NYE set menu despite it was the 30th Dec. So we cancelled and made a last minute booking at Aubergine)
The Showroom: Great disappointment. The place felt soul-less, gimmicky food average at best and certainly not worth the money.
Tank: Sushi bar at the Cape Quarter. Average experience.
Ginja: Great place but the service was very shambolic. We had to wait some 50 minutes for our main courses, and when they eventually turned up, our dishes were cold. We politely let the manager know, ans she offered a complimentary food and drink dinner at Shoga on our next visit, scheduled two days later. When we arrived, she greeted us warmly and upon completion of the (very good) meal, it all was indeed all complimentary. So we decided to leave the entire amount as tips to the waiting staff.
Bizerca Bistro: Great little place serving good French food. Only downside is the location, down on Lower Long Street, and on a Saturday night it felt rather desolated.

All in all, Cape Town provides some excellent places to dine, and generally they all are excellent value for money.