The KR 5u4g is excellentNice! That's something I would really want to try myself eventually...
The wait is long and painful, but totally worth it. I hope you'll get your Baltic 3 soon!
Seems like you will be busy once you get your Baltic 3... Please report your impressions with them. I'm currently using KR Audio 5U4G and not really sure where to go next, or if I should settle with that for now and look at replacing the lovely looking blue bulbs first perhaps.