Different Window Modules

I am going to be installing a directed viper 550 esp alarm in my 1995 toyota camry.  I would like to have window up and down control from the remote, but the directed ones are very expensive.  For 2 530t's (what i would need to do all 4 of my windows for up and down) it costs me $100.  On the other hand, around ebay there are window modules that i would need 1 per window for $15, making it $60 total.  I believe these are crimestopper modules, however i am unsure.  Should i stick with the directed modules and just pay the $40 extra or is it fine to use the other modules?  Also, i read something about the 530t being able to vent the windows while the system is armed.  Can i do that with these "generic" modules, and what mode does the 4th chanell input have to be on?  Does that mena that if i only want them to go 1/4 the way down when the system is armed i have to hold down the 4th chann whenever i want them to go all the way down, or is there a way to maek it so that when the system is armed, the windows only go down half way, when its disarmed and i activate the 4th canell they go all the way down?