Look at the old-style M200s as well ('85-'97) - not as vintage if you're worried about that (though I agree that with Pelikan 120/140s onwards that isn't usually a concern - the 100s are the ones that are more likely to need new seals) and they often go for very cheap. They're the ones that mostly say W. Germany on the cap and have two cap bands rather than one at the cap and one at the base. I particularly like the grey marble version.
If the listing says the piston moves, and you can see the nib looks ok, you are generally fine!
I've found the modern pens have a higher base price, but also have a ceiling that's well below retail, so while the vintage gold nibbed pens are the best value (and the prettiest!), it is possible to get a second-hand M800 for not much over £200 if you keep an eye out.
Oh, and check German eBay too.
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