I immediately am bound by law to tell you that Windows Home Server is garbage. I'm a Microsoft fanboy, I work in Microsoft and VMware environments, and I'm running Windows 8.1. But Windows Home Server is a waste of your money. There are a TON of free and amazing options. From that point, it's a simple matter
Luckily, with $1500 you can build a RIDICULOUS home NAS / a SAN with a ton of performance. Some things I'd be looking at:
http://thehomeserverblog.com/esxi/building-a-homemade-san-on-the-cheap-32tb-for-1500/ - 32TB a 4 1GB NICs for 1500 bucks (and it can be done cheaper)
http://www.smallnetbuilder.com/nas/nas-howto/31485-build-your-own-fibre-channel-san-for-less-than-1000-part-1 less than 1k and fibre channel? I'd avoid it just because it would add a ton of complication to your home setup... but sick nonetheless.
After you've got your solution built, if all your trying to do is back up your windows machine, you can easily just point the built in backup client to your new storage and setup a schedule.
Thanks understand your point about windows server! Lol