If you want to add a large range of cameras from different manufacturers, I'd pick either Exacq or Milestone (or both). You don't need to buy their boxes, you can just download their software.
Both have quite broad support, with Milestone's being broader but Exacq being easier to use. Both also update support fairly fast for new cameras / devices.
Seneca | IPVMU Certified | 09/22/15 08:20pm
A word of caution...
"You don't need to buy their boxes, you can just download their software."
This has been getting less true recently meaning if you install on a 3rd party hardware platform...you get zero support if things dont work right.
Dont get me started on hybrid systems.
Thus I would lean towards Milestone/ONSSI and a few others who are more supportive.
IPVMU Certified | 09/22/15 11:59pm
Thanks for the response guys.
Helped a heap. Just another quick one, but have you guys heard anything of the Digiever range?