I too can vouch for the 5D.I use mine for time lapse of construction projects. I also use a Brinno they are almost bomb proof. They are a fixed lens camera just for time lapse, there are a few options from Fish eye to a zoom. I have the wide angle, it's less than the fish eye but has less to no distortion. They are also about £2800 cheaper than the 5D.
If you want a go let me know Will bring it when I come down to see you.