I do think that your best bet is probably to break them up into much smaller lots centered around specific types of collector interest. There have been a couple of sellers on Ebay over the years that have sold large lots of all the progs and all the megazines, but when you look at what they got for them, they likely ended up leaving a lot of value on the table as anything above the first hundred or so progs is worth a fraction of the earlier ones, even in high grade. The magazines are almost all low value, even in high grade. As a US based collector, I will say that postage from Australia is fairly reasonable and I frequently buy comics from dealers like Kings and Alternate Worlds. I know I would love to purchase your Diesel variant and anything else more unusual that you have including variants or unique items, so if you do decide to go the auction route, I hope you'll give me a heads up.