Car alarm, aftermarket or OEM?

[seatech30]

Hello, I've established that my car previously had an aftermarket alarm installed before I bought it, but was removed at some point, crappy harness splices behind the secret compartment.

I'm trying to decide if I should get the oem module 89730-52030 ~$200 or an aftermarket maybe viper 211HV http://www.yarisworld.com/forums/showthread.php?t=55973

Would it be possible to get the antitheft module and just plug it in? I found this, I do have the odbii usb version with techstream, but have yet to use it before. https://m.youtube.com/watch?v=y0orOulWiPo I was thinking maybe I'd get lucky and find the module at a pickapart.

Ideally I'd like to have an alarm that uses the keyless entry already on my keys.
Being able to adjust the sensitivity would also be ideal.
Being able to arm the alarm silently w/o honking is also important to me.
Last, is price, $50 or cheaper would be great.

I'd appreciate any recommendations.

2008 yaris sedan 1.5L.