I would recommend purchasing one of the books that covers radio receivers,
such as "Short Wave Receivers Past and Present" by Osterman. Then page
through it and decide what features and look you want.

I am just restoring an old Hallicrafters S-40 for a friend. It is one of
the simplest short wave receivers, but generally work fine for short wave
broadcasts.

Purchasing a short wave radio is like buying a car and is very personal.

Colin K7FM