The MOST "enthusiast's" in the 60's would have bought Paramount's, they were the only bike at that level with widespread availability here by far.
By the 70's, Raleigh Pro's, PX-10's, then also Moto TC's, Cinelli SC's and a flood of custom builders, Merz, Newlands, DiNucci, Gordon, Sachs, Eisentraut and a slew of others, some huge, some small but collectively had a huge impact on cycling as many "enthusiast's" wanted something even better than off the peg top of the line as more people got on board and walked in to a shop saying "give me the best you've got" not having a clue about it.