RS3 vs. Intelliguard 700-IQ

I have an IG700-IQ with smart windows(closes sunroof too), proximity sensor, and dual zone piezo sensor. I have in my hands a brand new RS3. I like it, remote start and responder remote. But I know it's kinda less than the IG700 I have in my car now. What I want to know is- 1. Can I use the smartwindows with the RS3? 2. Would I have to buy the DEI 530T if I can't use the smartwindows, and would the 530 have an option of closing the sunroof upon arming? 3. Would I have to get another proximity sensor-the DEI 598D-ir I can't use the one I have now? 4. How many channels are on the RS3 so that I know I can pop the trunk, sunroof, etc. For me... a hard decision... Please let me know. Thank you in advance for your time.

You can download the install and owner's manual from www.directed.com.