Lots of sound advice there.......................but the main one being......get an indie inspection done regardless of whose selling the car and regardless of the cost to buy of the car.
Theres a link to a check list on another forum for nearly everything to check out which I think applies mostly to 4200s, which I will put up shortly.
Look at plenty, take plenty of test drives, get your eye and ear in for looks and sounds.
Try to stick to your budget, but as always a well sorted full SH/thick sheaf of bills one, beats one without everytime hence paying a bit more at buying time!!!
Keep a fund for wear and tear items as they are now of a certain age, plus a tyre/clutch/brake fund ( though all these costs have and will reduced in the near future esp if we get confirmation of better value discs and clutch relining options!!!!)
Let us know how the search goes and good luck again!
P