In my opinion, this is really a question about memory card capacity in the camera, not on your computer. Just because you shoot the RAWs doesn't mean you have to keep them.
I would shoot in full RAW, discarding the files I don't want to keep (or keep JPEG copies). That way, if I happen to get a spectacular shot, or a shot that's just right but the exposure or white balance is a little off, or a shot I actually do want to print large, I can take advantage of the full, lossless RAW file.
Depending on your keeper rate, this strategy could be a hassle, but I always like knowing I've got the best I can get when I manage to produce an excellent photograph. One way to speed up the process, if you have a low keeper rate (or a low rate of wanting to take advantage of the RAW file) is to simply save the few you want to keep in a different location. Then sort the other files by file type, select the remaining .CR2 files, and delete them.
By the way, Full HD (1920x1080), printed at 300dpi will make only about a 6.4" x 3.6" print.