wish i had your problem!
try to get some sweet, some bitter and some sharp, and bs yourself up a blend. you can find the characteristics of all the varieties online, for example
although you might not have those british varieties you should be able to get info on a few american varieties that match the characteristics, and look for those
i have seen various instructions to use or leave drops/windfalls, everyone seems to have a different opinion, personally i go with anything that isn't too manky so am not opposed to the cheap windfalls and small weird ones that the grower collects, just avoiding obvious rot