I keep going back and forth between these and really cant decid at all. I am 100% happy with the sounds from my current rig and don't really need anything its more a massive WANT and it will also take up some of my spare time and give me something to focus on for a while.
And it's fast coming up on time for me to actually get to build something for myself.
The Uber is a definite one to do as I want to see if I can address the flaws as I see them in its sound and make it truly awesome.
The MKIIC+ is a definite one being a massive Metallica Fan
The Krankenstein less definite but I see a lot of room for improvement on what is already a fairly decent base sound
The DR I can probably just forget about but it would be nice to have just for the sake of it and for the experience of building something so OTT.
Also rather than which is more awesome. Look at it as which you would like to see being slapped together and will probably stress me the hell out at some point or other and make me want to quit.
MkIIC+ would be my vote. The only one not still available to buy new, so the build will be the easiest way to get hold of one.