Hey guys this is my first question submitted on this website, so i m still learning the ropes...

I have noticed that a couple of houses down from me that they have an old (i estimate 1980ish) Alfa Romeo Spider Veloce Injection, 2 seater convertible, which hasn't moved for about a year and is covered in dirt and cobwebs, it also isn't registered and has no number plates. So it is obviously surplus to requirements and I would be very keen to take this off their hands for the right price. I actually have 2 questions regarding this.
#1: How much would you be willing to pay for an average one of these? (and yes i realise that the better the condition the more expensive it will be).
#2 What should i keep an eye out for if/when i end up inspecting it? (i know that rust is a major concern but anything else in particular?)

Any comments/ideas on the matter would be greatly appreciated.

Thanks.