As I noted in comments, I think that you can generally expect that a company that makes a good circular polarizer will like also make a good linear one. However, if the purpose is to reduce cost, because of different lenses (now and in the future), then there is an alternative option: Lee Filters or the Cokin P Series.

In a nutshell, these are square/rectangular filter systems that you purchase an inexpensive filter holder that slides onto diameter adapters (also quite inexpensive) and then slide filters into the adapter. Most, as I noted, are rectangular except for the polarizers. These are round and fit into a special slot on the holder and then you adjust as normal. The polarizer is large enough to handle lens diameters specified by the chosen system and so you can get quite a range (I'm ranging from 49mm to 77mm with one polarizer).

In terms of quality, Lee is generally regarded to be better than Cokin, but is also more expensive. Cokin is, however, decent and may not only cover your needs well, but may be easier to find. Either way, I literally saved close to a $1000 on circular polarizers and other filters by going this route.

The final upside is that you can get a lot of other filters, such as ND, graduated ND, and more and use them on your lens collection. Saves a lot of dough and there are third party makers of these filters for the two systems.