Please do not be discouraged by the lack of shiny effects. You want a logo for a successful company, not a web user interface. This logo is confident, understated and bold. You can ask for any changes, and I will be making more concepts later. We can speak in Czech if you want to.
Same goes for this logo, this time I went for a very clean minimalism, again to display bold and confident qualities about your company, with a little twist. I can always add effects to these logos, but I would not suggest it.
In case you are looking for something more fresh, here is a logo that keeps the same values I tried to impress with my previous entries, but with a little twist.