Tbh the server proposed by you is half the speed, and it's just overpriced for what you get. Especially considering that esxi have great compatybility with home user market components. And even if you still believe that the hdd controller on the mobo is poor or additional network card is required. OP can simply downgrade processor to quad core phenom or fx4xxx and still have better performance than dual core i3. Extra cash will easily get him extra lan card and hdd controller with
tbh in my opinion is not required at the beginning. Going for proper servers have no sense unless you are looking for out of the box solution with full support from the manufacturer.
Slso server listed by you is more of file server/web server, something for small bussines and was never design to do any serious work. For example I can't imagine this server hogging exchange. Even description says it
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"HP ProLiant ML310e Gen8 Server, a single-socket 4U tower, delivers essential availability and expansion needed to accommodate changing business needs. It is ideal for remote sites and corporate branch offices running file/print, web messaging, and small vertical applications or databases."