I've got Progressive for the R1150R, and I believe it's around $450 a year, coverage limits are a bit higher than yours, but I also ride all year long .
I've got Hagerty for the R65 (collector vehicle insurance), cost is $145 a year, I checked on the Moto Guzzi with Hagerty, and it's $140 a year, the '84 LS will be around $140 as well .
I was told, that when I do finally get them all insured, the price will probably go down to around $110 a year for each bike, due to multiple policies .
But you are limited on your usage, can't drive it to work, just pleasure usage, and you need a 'regular' use bike, so if the R65 is the only bike you have, they won't insure you .
Also the bike has to be valued at least $5000 or they won't insure it as well .
So I claim the '81 R65 is worth $5500 .