Any of the 3 are excellent systems and made to very high standards. They should all last a lifetime and will all get your knife as sharp as it can be.
The KakBritva "Luch" is a great machine and unbeatable value for money with lots of upgrade options but in the current political environment you may find it hard to get hold of one and even harder to manage after sales support. TSProf K03 are also excellent, but a little more pricey than the rest. Upgrades for the K03 are also very expensive.
I have, and use all of them and I keep falling back on recommending the Hapstone R2 "Standard" version that Gritomatic sells. There really is no need to get the "Black" version as you don't really need 2 sets of Universal angled clamps. Pair it up with a set of Venev stones, a digital angle cube, a Hapstone fine tuning adapter and a set of spring stoppers and you have an unbeatable system. I typically recommend the Hapstone system because of its versatility, modularity, upgrade-ability and extremely good value for money.
Personally, I would buy from Gritomatic. They are a USA based company with great values and excellent after-sales support.
Has Gritomatic gotten back to you yet?
To add some confusion - if you're willing to wait a little while, Gritomatic will soon sell the Kazak "Mosquito" system for (I'm guessing) around $200. It is also a great system and very cool looking sharpener.
Here is a Gritomatic stock photo of the Kazak "Mosquito" :
Now that the Luch is available, would you recommend it over the R2 if money was not a concern?