Concerns purchasing Vintage System?


I'm looking at purchasing a system from a widow that hasn't been played in 20 years. What should I look for? What should I be worried about? I'm a newby to hi fi of the price range.
Audio Research d250
Audio Research d90
Audio Research sp10
Oracle Delphi
McIntosh MR80
Tandberg 3014
La scala
Magnepan MGIII
wsrhue
Onhwy61

I'll part out some of the pieces with hopes that it will cover what I want to keep.

I made an offer of $800. I figured it is a low ball offer. I'm prepared to pay more, maybe up to $2000.
The horns in a LaScala have no surrounds. Those are the only things behind the grille. The woofers will have a treated cloth accordian surround, which cannot rot. Getting to the woofers would be more trouble than it's worth. As long as you're not hearing any odd noises, don't mess with them. Regarding the electronics; just plan on at least replacing all the electrolytic filter capacitors in the power supplies, regardless of how they appear to the eye. Electrolyte dries up(impedance and ESR rise) over time, and caps often show no outward sign of defect.
I made an offer of $800. I figured it is a low ball offer. I'm prepared to pay more, maybe up to $2000.

If you get the whole package for around $800, there is no risk!!
Warhue come on 800.00 bucks for 3 audio research pieces. The offer of 2g alone for all 8 pieces is a steal.