Well, only a week to go and no doubt there will be a machine to suit you at this auction. It looks to be a good one. I do like the way you say your "one and only machine". Yeah right, like that's going to happen.
It's clear you're keen to get this right. Definitely make contact with some of us on the day. If nothing else, we can take a look at any machine you have taken a liking to and check it's in good order. By the way, I'll be the fat guy with no hair near the bar, possibly talking to the fat guy with lots of hair.
Why not look at it this way? First thing is, you have to like the look of it. No good buying a reliable machine and can't stand the sight of it. It has to play a reasonable game. It's your only machine (as yet), so you want to enjoy playing it. Understandably, you need a reliable machine, although you will soon be digging inside to see what makes it tick. You have budget. Of course you don't want to tell us lot what that is, BUT you could look at the online catalogue and we could give you a private idea of what that machine might go for so you can adjust your plan of attack. No good waiting all auction only to find the machine you had your eye on started higher than your bank roll.
Here are four machines, all or these are or were in my collection and not in the auction, but there are examples of each in the auction. Which style grabs you?