Having real good luck with mSATA and M.2 drives on the PC side, and they are nice and small enough to fit inside a Miggy. Curious what kind of speeds you'd get out of an IDE adapter, though.
Built a new gaming PC about a month ago with dual M.2 Corsair 500 GB SSD drives over PCIe adaptors (Asus Hyper M.2 X4) and am getting a solid gig read speeds over a RAID 0 setup. These things really haul ass, lol.