NVR Tech Specs Recommendation?

Following up on my original thread (https://ipvm.com/forums/video-surveillance/topics/recommendations-for-a-gym-surveillance-system), I have all my cameras and DW licenses. Now is time to get the NVR and set it all up. I'll be doing 40 recorded streams @ 720p and will probably produce 1TB/day which is enough for 7+ days of archive. Anything longer than shouldn't be necessary.

Based upon suggestions, I'm thinking Dell T30 (Intel Xeon E3-1225 v5 3.3GHz Quad Core| 8GB RAM) with 256GB SSD Ubuntu OS and then 3 x 4TB HDD for recording. All this would be about $1K which is my ballpark remaining budget. I'm skipping RAID due to cost -- if a HDD fails, so be it until it is replaced.

Input/thoughts? Is there a better way or am I being dumb somewhere?

Side question - can DW handle 3 different individual HDDs as archive destinations? I'm assuming yes.

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