The 3 links you posted don't work for me. If you want some cheaper SimonK ESCs, go here: http://www.myrcmart.com/esc-ubec-rcx...22_82_238.html
The RCX ESCs are just as good as the RCTimers.
They probably have the RCX motors with the same specs as the RCTimer motors, too. RCX motors are also just as good and cheaper.