I would recommend against an all-in-one solution that includes a DAC. There is so much progress in the DAC field right now, especially in sub $1000 DACs. Some DACs are even being designed with boards that can be swapped out when improved chips or designs are available (Wyred4Sound and the forthcoming Schiit DACs both offer this in their designs).
For a great integrated that can act as a headphone amp and a balanced pre, I'd check out the Little Dot Mk VI (only balanced inputs and outputs) or VI+ (balanced and RCA inputs and outputs). I use it with my HE-5LEs and love the combo.
For a great integrated that can act as a headphone amp and a balanced pre, I'd check out the Little Dot Mk VI (only balanced inputs and outputs) or VI+ (balanced and RCA inputs and outputs). I use it with my HE-5LEs and love the combo.