Tbh there are concerns with setting them up and in general I'd prefer to avoid them.I've heard McConnell, there do seem to be a few who are already raising concerns over this . Can only hope it's more than a trickle .
On the special prosecutor/independent commission line , obviously im in U.K. So clearly not as familiar with it as yourself . It seemed the only option to me but I've just heard a former Clinton aide Simon Rosenberg bring scathing about Trump but raising similar concerns to McConnell saying that it could then take up to three years to resolve .
However Nunes seems to have corrupted the House investigation, Comey firing taints the FBI one (unless Trump makes an unusually unbiased replacement) so the only investigation with any current appearance of impartiality is the Senate one...so a whole lot of pressure on it.