Now you're getting the feel of what's involved I think you should take stock of where you are with this.
First it's clear you genuinely want to own a machine and not just a "talking point " in the corner.
Second, you are, as a beginner, scared the machine might not work/breakdown and it looks like a mad house inside. On this point don't worry, these machine were built like battleships (as you will notice when you try to lift one). Whatever machine you buy, with our help or a little experience you CAN fix it, ALWAYS!
Third, buying a machine is a very personal choice, and that's why us lot are pussy footing about and not telling you what to do, but as you may have noticed from the later posts the boys are getting a feel for what you are looking for and making more definite comments. So I'll join the throng. Please note these are just ideas and you (and others) may not agree.
If I was spending that much money, and it was my first machine I wouldn't buy that machine. The Segas are nice (I have one in my collection and sold one at our Coventry auction in November), but they are late machines and lack both history and the classic lines of a truly collectable machine. Look for a classic machine that's working when you buy it. Ask a local forum member to go look at it with you (he will). Coming from HP is a plus at a price and not always a success. I know of two people who bought from him and the machines did not work 100% from day one. HP will help and is by no means a con man but these machines are old at best. Unless the stand is something special, look for one elsewhere and save the money.
Just to show how we might think differently from a newbe, when you said the machine was just waiting for LED lighting, the general scream from the forum members was heard from here. Treefrog went and sat with a couple of dozen of his machines till he calmed down, BP had a little lie down and Mr P. himself had to call nursey.
Here are a couple of photos of machines I'd prefer (can you guess I like the '30s-'40s designs?) with rough prices you MIGHT expect to pay for a good one. I you look at these and they don't grab you over the Sega... then buy the Sega. You know you want one, and we will look after it for you one way or another for sure.
Someone said earlier that if you buy the Sega expect to lose money if you sell it... very true. The machines below however would not lose their value and might be expected to increase.
Mills Hi-top £600-£800
Mills Extraordinary £750-£1000
Jennings Governor £850-£1000
Buckley "Criss Cross" £450-£600