I don't know about anyone else, but I'd like to know a few more details. Like, how much storage space you have, and/or percentage of storage space used, and what kind of storage device is being used. For example I have a movie library of 228 HD movies and growing. All stored on a 4 bay qnap, 8 terabytes formatted in RAID 10. So far I've only filled about 35% of it.
I started off a few years ago with simply having a PC that had 4 hard-drive bays and putting 4 1TB drives in and using that, however as time went by and I started getting more concerned about loss of files and a growing collection of media (doc's, photo's, home videos, music, movies and tv shows) I realised I would need to thing about something different.
So I looked at using Drobo, Synology etc. but wasn't totally convinced and was concerned at expansion, cost etc. so finally in 2008 I moved to Windows Home Server v1 using an HP EX495 home server with an esata 5 Bay drive tower enclosure using port-multiplier for extra storage space. This worked pretty well and I liked the "duplication" feature of WHSv1.
Late last year it finally got to the point where I needed further storage and as the HP EX495 only had one esata port I decided to bite the bullet and upgrade my server. What I did was take an old PC that I still had, bought a new motherboard, i7 processor and some new RAM and built a new home server with a 256GB solid state drive on which I installed Windows Home Server 2011 together with Stablebit Drivepool (to replicate the old 'duplication" function under WHSv1). I now have 3x3TB drives inside of the Server instelf, 2x5 Bay Tower Enclosures each with 5x2TB drives and 2x3TB USB drives which are all "Pooled". That means currently there is 35TB of which 13TB is used and 13TB is a "duplicate" thereby leaving 9TB free (although really only 4.5TB due to duplication). Expansion capacity is huge as I can just keep adding drive tower enclosures.
I am easily able to stream full BR rips (30-50GB) to my aTV's or Boxee Box wirelessly. I have an ASUS RT-AC66 router and the streaming devices have dedicated access to the 5Ghz band - can't wait until Apple uses "AC" in the ATV and I get full speed out of the router.
One interesting note is that I run iTunes natively on the server and have no problems with that at all - some say you can't do this but I've had no issues. This speeds up streaming as the path is simply
aTV-router-server-router-atv instead of
atv-router-PC-router-server-router-pc-router-atv (if that makes sense

) and it means I can shutdown my PC whenever I want without worrying about cutting out access to the server from the aTV's or any other device. I still run iTunes on my main PC and that simply mirrors the iTunes on the server and I'll play music etc. from that in my office if I'm working (as the server doesn't have a soundcard and is not connected to speakers).
All in all I'm very happy with the setup and it should be reasonably future-proof for some time yet - fingers crossed
