'Scopes' are not too expensive. If you can afford to put a RDS on a TM G36C, you can afford to put one on a CA G36C. Key thing to consider is that stock scopes usually have very poor eye relief and stock RDS aren't that bright or sharp.
Any of the weapons you listed are great. They all perform pretty similarly, since they're all running mini batteries and except P90 uses version 3 mechbox. I would hold them in person and let ergonomics and aesthetics be the deciding factors.
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"The Bird of Hermes is My Name, Eating My Wings to Make Me Tame."
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