Help needed for arduino and gsm modem project

Hello ppl,
I need some starting points and some feedback on how to go along my project. I plan to do a GSM based home security system using arduino as my micro controller. The thing is I want to know which arduino can be used with a GSM modem, proximity sensors, motion sensors and an IP cam or normal webcam. I would really appreciate it if someone can give me some feedback on where I should look first. If anyone needs anymore info about the project let me knw.
Thanks alot

I think most Arduinos can handle your task, but more detail is needed, especially about the GSM modem and the IP camera. And also about the number of sensors.

What do you want Arduino to do with the camera ?
Which GSM modem are you going to use?

Depends on how many I/O points you envision. GSM interface simple: Tx and Rx for serial communication (I included an additional line to toggle power on the GSM). Prox and motion are one I/O line each. Not sure what you want to do with the IP camera, but an ethernet shield can certainly talk to it.

I want to use 2 sensors. One proximity sensor and one infra red sensor. As for the IP cam I want it to act as a surveillance camera. If I use arduino ethernet shield do I still need another arduino for the sensors and to interface with gsm modem. Also can anyone let me know of a cheap gsm modem that can be used to send text without video streaming feature.

Must read this stuff.....

it might be useful...

Cameras and Arduino generally don't mix.