Ok. I've got the first scaler from my queue
It's Crestron HD-Scaler. It's not actually consumer product, but it can be found on eBay for very good price. I've got it for 33USD only (unfortunately shipping cost was another 35USD). According to description, this scaler supports many different signals (RGBHV, RGBS, YPbPr, RGsB) with wide sync freqs from 576i50 to 1080p60 with the same connection unlike chinese scalers where you have to plug either to SCART or VGA even if it's the same scaler.
And it really recognizes all RGB/YUV formats. Unfortunately it's very picky to progressive scans and cannot display scandoubler video of 320 lines (BK0011M, ZX with Pentagon timings), although interlaced 320 lines video works well. Also i couldn't make work DBLPAL/DBLNTSC/HD720/HighGFX video modes of Amiga (actually, even on real Amiga i couldn't these modes work with this scaler).
Those cores generating 312 lines with scandoubler works just fine. So, it most likely just Firmware problem. Unfortunately Crestron has strange policy of FW update and doesn't allow to update by anyone but only authorized dealers and partners. So, i cannot update it. For those 320 lines scandoubler modes the scaler recognizes the video format and displays 576p50 in info, but video stays black.
Besides picky to progressive modes, it works really good. Has a lot of video modes to output. A lot of setting of picture scale, position, color adjusments and so on..
There is another model on the way to me - Crestron HD-Scaler-VGA-E - this newer model replaces HD-Scaler in production line. I've got it on eBay as well for the same 30USD. I hope it will be less picky for progressive modes.
Also i will get Atlona AT-HD500 scaler. I've saw this scaler mentioned in this thread and that user stated it supports just everything from MiST he tried. Well, i will see