if you decide you want the micrometer (invaluable for fine adjustment of VTA/SRA), it also is not offered on the ClassicThat's not true. It's a 90 Pound option and includes the VTA lock.
I would just opt for the Series 5, (which I did). It's worth the extra money. I also have a series 3 or 4, I can't remember which.
Even if you can't afford the series 5, the Classic is a hell of an arm.