Hi Dogealum,
Actually i had the X03 SE for a few months, thn upgraded to the X01 D2, and a year ago upgraded to the P03 D03 duo.
What i can tell you from my experience is that the upgrade to the, at the time top one box was a big step, but the upgrade from the X01 D2 to the separates was actually a bigger step forward in comparation. I was very impress by the gains all over I got when going to the 03s from the X01. Far more than when I upgraded one box units. This came as a surprise to me.
The X03 was a fine player. Now the P03 D03 is at a totally different level ( sonics but also $$$ while...). If u have the means my advice is to go this way.
I would not go with the clock and your current unit. Im now considering the clock for the duo, but people say for one box units effect is very very small to none (I dont have first hand experience here though). But the change from X03 SE to the 03 s is anything but small. Quite huge all over.
Dont have experience with the 05s but people say the 03s are more balanced and better performers.
If I were you I would upgrade to the P03 D03 s. Thats exactly what I did, with one step in between, and i dont regret where I ended. after you spend some time with the separates, try to audition the clock ( i will do it myself in a few days) and see what it adds up if any.
I would only have one doubt if i had to buy brand new now: Are they maybe about to release a new P03 D03 like they just did with the top one box model (K01 I think is called)? If so, you may want to wait but how to find out? Dealers probably have no clue
Hope this helps
Best
Eli