I am trying to take photos at about every 30 secs - 2 mins (Timelapse imagery for a dataset). I was using a canon t3i for this but after a few weeks, my shutter gave up. This is an on-going process and I will need to continue taking the timelapse. I wanted to know the most economical camera to get more clicks for the price (lowest price per photo clicked). I also need the following features:
Multiple exposures for HDR
Auto shutter speed
Atleast 15 MP
I was wondering if it would be better to buy a high grade camera like 7D or 5D which give about 200k clicks or go with the rebel series which have about 100k clicks and replace the rebel series camera after it dies. Also someone suggested to look at Mirrorless cameras, are they any better? Is there a way I can just get the shutter (or other mechanical parts) replaced economically instead of replacing the camera.
Thanks for your help in advance