You only need a GPU for plex if you are transcoding your media..
IPMI is a life saver, I would not buy a MB unless it has it. You will find out soon.
You don't need a 1TB drive to boot, it's gonna be wasted space with ESXI. You don't need anything bigger than 16GB to boot. Further, you should get a drive that is qualified with your motherboard, as there are sometimes issues with booting from an unqualified drive: M.2 List | Supermicro
You will also need a drive to store your TrueNAS VM so that it can boot up and then offer shares to your servers (using your hdd or ssd pools). If you are using all the data port and the lsi 3008 for storage in TrueNAS, you will probably need to use a pcie slot or one of the oculink ports to get storage.
If I were you, I would get one of the p3605 in the great deals section and throw that in the x4 slot for local VM storage. That will hold you for local VM storage for a while.
IPMI is a life saver, I would not buy a MB unless it has it. You will find out soon.
You don't need a 1TB drive to boot, it's gonna be wasted space with ESXI. You don't need anything bigger than 16GB to boot. Further, you should get a drive that is qualified with your motherboard, as there are sometimes issues with booting from an unqualified drive: M.2 List | Supermicro
You will also need a drive to store your TrueNAS VM so that it can boot up and then offer shares to your servers (using your hdd or ssd pools). If you are using all the data port and the lsi 3008 for storage in TrueNAS, you will probably need to use a pcie slot or one of the oculink ports to get storage.
If I were you, I would get one of the p3605 in the great deals section and throw that in the x4 slot for local VM storage. That will hold you for local VM storage for a while.