suggestions on upgrading my system

What do you feel is the weak link to you're system? I would upgrade my amp stage... This is what I have and I absolutely love this piece... http://nadelectronics.com/products/masters-series/M2-Direct-Digital-Amplifier

I believe the weak link might be the phono/preamp stage in your integrated.  Obviously different ways to attack this. Maybe getting a outboard phonostage 1st. Also can the amp be separated from the pre in the HK?

replace harman karden