1) The web interface can be set up to use any port number you want.
2) Yes, Geo can mail you a snapshot when motion is detected. Can even have it send you SMS messages if you have an SMS modem (or use SMS e-mail from your cell phone provider).
3) I bought my card (supplied with software and pigtail cables) from a reputable dealer in CCTV forum. There are many fakes out there. Fakes WILL cause you upgrade issues.
IMHO......
If security is important to you and you want the best, it will cost you (in this case) about $700-800 for a GV-1240 8 cam card (I haven't priced them in a while...maybe cheaper now???). Ouch!!!