Here is a Microsoft guide to the differences, ignore the salesy stuff they include though.
Differences From this list key ones that may impact a home user would be:
Multi-processor support (could you see yourself running dual processors in your home machine? Some high-end gamers do ....)
Security - do you have your own network at home with other PC's in which you share files/folders between them? If you do their are other administrative benefits that could apply such as roaming profiles/GPO's etc - but you need a domain to leverage these.
Multi-lingual UI pack - do you have people using this PC that are multi-lingual who would want this feature?
In short, unless you need anything on that list I'd leave it how it is.
