Hello hdoan,
indeed, dvSwitches are best used from the get-go instead of choosing to migrate to them when the networking environment has been estabilished. Although I am not aware of any vSwitch limit, the maximum limit is 4096 ports the vSwitches can serve in total.
Nevertheless if you feel confident in managing a dvSwitch, go for it! It provides some additional features (ingress traffic shaping, Network I/O Control, and Private VLANs and a few more...) It will ease up your life with network setting in future deployments. Just be sure to back up the config once in a while 
You also have a lot of options for redundancy and your network can be estabilished beautifully with 8x 10GbE uplinks.