I researched this for a friend 3 month ago. The only reasonable priced company up to date with drivers was
PreSonus (FireStudio Project 8 inputs $400), they have smaler units too. Evrybody else is dragging their tales with drivers unless you want to go (slower USB) I have Alesis iO|25 great firewire interface, stay away! No driver-upkeep at all. I only buy from a company with regular driver updates. I wish Apple would take over on that. Good luck.
MOTU and UA. MOTU seems to believe in diligence when it comes to supporting their legacy products. Good price/quality ratio. 828 mk3, 828 mk3 ultralight and the new TRACK16 are all great products. if you need more preamps the 8pre is a nice addition UA is creating the thunderbolt interface with the apollo. SHould be nice. I don't work for either company but I wish I could afford one of them because my tascam fw1082 is useless now. Why does logic have it listed in the controlers now? Presonus just pulled a tascam and dropped support for a bunch on the FW interfaces. they list it on their website.