[amsat-bb] Which rotor to buy?

[PA3GUO]

This is my current antenna setup:
http://www.pa3guo.com/a7.jpg
Basically, 6 ele for 145, 17 ele for 440, 23 ele for 1200, small quad for 23, and a multiband vertical.
I am planning revise and clean this.
AZI rotor kr400, 30 years old, 20 years by me, and 20 years in use. 
ELE rotor kr500, also 20 years in service.
I know how to clean these rotors, but consider to replace the AZI rotor with a new one.
Any advice?
G450, seems less strong as the kr400.
G650?
G1000sdx or dxc?
G5500?
I do control these for sat tracking.
Is variable speed in that case a disadvantage?
Other thoughts?
Here is a comparison table:
http://kur02.com.au/index.php?option=com_content&view=article&id=23&Itemid=32
I tend towards a G650 which costs around 425 dollar here, the G1000 dxc is 600 dollar.
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Henk, PA3GUO