Headphone output comparison on "all in one box" solutions.

Hi,

I'm looking at replacing my current amp and speakers and I'm having a hard time deciding what direction to go in regarding the DAC/amp/headphone amp part. Does anyone have any thoughts on the quality of the headphone output on Leema Acoustics Elements DAC/Pre amp and Audiolab 8200DQ? I like the idea of a one box solution like this driving a poweramp. Sources would be laptop, TV and DVD/CD. How would they compare with say the Musical Fidelity M1 HPA & M1 DAC or NJC Monitor II and reference DAC? Budget is around £1000, not including power amp, source or speakers.

Would have to drive Senn HD650 and perhaps Audeze LCD-2 or HiFiMan HE-500 in the future.

Thoughts/experience appreciated.