If u r using any Native Instruments software I would go for Komplete Kontrol by NI, they have a full range, metal and sturdy and intergrates well did Logic......even if not using NI it is a great midi keyboard so.......
Yes, I use a Seagate external Hard drive and keep all my Native Instruments content and just used a Symbolic Link to Auddicts PercX, all Machine Stuff there as well as Apple Loops.