That's like asking how long is a piece of string lol.
Insurance cover differs from one vehicle/person to another depending on the criteria that is requested by the insurance companies and the insured. Only way you will know which company offers you the best quote is to ask them, there is no short cut.
As you are probably already well aware each insurance company quote low for the first time you insure with them then hike it up for the following years, so, altho I can't recommend any specific company, I would say you'd probably need to change companies each year to keep your premiums low.
*I found ebike insurance pretty cheap cos they don't have a broker, it's direct from them but they only deal on the net.
* that info is from about 5 years ago, when I last rode my own bike.
John,
I found MCE the cheapest when I got the ZX6R 4or more years ago and since, had tried Bennetts but MCE gave me same cover from same insurer plus breakdown recovery for £80 less. Other advantages are they sponsor BSB and there are some benfits like early pit pass, track pillions with the riders etc. Give them a try.
Found MCE to be cheapest - even for exotics - though never accept their renewal quote - ringing up and asking them to look again (advising have been quoted cheaper) usually reults in a lower premium
I do believe the official length of a piece of string is 5 feet 10.5 inches. but then again I could be talking a load of horlicks like most insurance companies. see how i got it back on topic there.
get a renewal quote for your current insurers and then get a on line new quite. ring em back and get them to match it.