Insurance wont be a problem.
Now, lets make one thing perfectly clear, this is a Part91 box hauler?
I started flying a C210 at about 100TT, got my HP in it, and insurance only really required 10 in type to sign me off. Depends on all the liability youll want for the aircraft but for a part91 hauling boxes, you can get rid of alot of the crap to keep your insurance costs down. Now the more you fly it, the more insurance will go down. The 210 is my favorite single to date. Ive flown ever model from the NA C210, turbo 210, p210, and the turbine 210 its a beast. Its stable, hauls some weight, has a good range, speed, good altitude for a single. Im actually considering making the purchase.
and a little heads up from one centiorion driver to another, that landing gear system is a nightmare. I don't know if your company owns one already but if not insist that it have the gear mod. You loose a few kts but those gear doors suck. Also, those power packs for the gear, keep an eye on that damn thing, they like to smoke up your cockpit. One of the 210's I flew had the extra large gear handle. You put it in the up position and once the uplimit shutoff it reset it to the nuetral position. Well, solid ifr single pilot getting out of the Chicago Bravo can be fun, but a real workload, twice i missed that fact that it never reset to neutral and not only had a maintince issue, i had smoke in the cockpit and I didn't make it to my destination as scheduled. But all in all, i love the airplane. Fly safe.
Mark