Hi-Flo are generally good and are consistent. There have been some discussions of varying quality of filters from different sources (I seem to recall Tunisia being involved); these were filters sold as MG OEM.
Regarding non-motorcycle filters with wider availability - you won't save any money, but Mobil1 M1-102 filters are the correct size, thread, and pressure relief spring for the 2 and 8 valve 1200s (as best as I can tell from my research). My Norge has used them for almost all of the 105,000 miles it currently shows, with no apparent problems. While a bit pricey, they are available almost anywhere.