My son and I are learning to play the drums. We live in Cape Town so the choice is limited and expensive. I've seen a brand called Mapex and the QR Series seems OK to start off with. I'd appreciate the forums thoughts on this and comprable makes such as Ludwig, Pearl and Gretsch. I've been offered a second Gretsch Catalina series. Any thoughts on the quality and what to look out for on a second hand drum set?