I bet the Seneca V is a an easier ownership proposition. The 58P is quite specialist but is a race car in the sky when on form. I have a friend getting 240ktas true at FL240 in his one as the fuel tab is picked up by the rear seats.
To get back to the original topic roughly, it ll cost lots and perplex and entertain you at the same time owning a twin. Agree the Seneca V is v capabable and refined design.