MIT ICs I have tried are excellent and mellow up top compared to others I use. I think you can find MIT ICs for less than $750 that fit that bill. I'd recommend trying those first before dropping big bucks on wires.
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Best bet would be a pair of Jade Vermeil, small manufacturer, but here is a link: Jade Vermeil Gold.
If you want to stay with a "big name" company, try Tara Labs, they are musical yet still have some air. There are a lot of cables that will be musical, but most won't provide much air in the highs.