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Depends upon your budget. Easy recommendation is RME. Will cost about $2k new.
RME Audio Professional Live, Studio, Recording and Broadcast Solutions. Unrivalled Quality, Performance & Stability MADI Interfaces, Converters & Preamps.
rme-audio.de
Cheaper, but a bit of bother on your part is the E1DA Cosmos ADC. There are threads about it here on ASR if you do a search.
Both offer at or near state of the art performance.
The Topping is good for the money. Maybe you could fill in more details of how you intend to use the ADC. Speaker measurements, electronic gear measurements or what?
Some of the MOTU interfaces between $500 and $1000 are a good in between choice.