Build? Buy? HALP.

[kronik8]

My environment:

1x HTPC
1x MacBook Pro
2x Laptops
1x PowerBook

Wireless-N DD-WRT routers.

Purpose of device:

1 - Redundancy
2 - Backup all PCs, preferably with iterative imaging. TimeMachine compatibility.
3 - Media Server - 1080P / iTunes / etc.
4 - Print Server?
5 - BitTorrent?

I've been eyeing the QNAP TS-509 Pro with the intention of putting 2TB drives in it, RAID 5. I've no idea what would provide similar performance, capability, etc. regarding hardware. If I were to build it, I'd like to stick with a form factor similar to a pre-built NAS (read: small). I briefly considered WHS but I'm not sure that will fit what I need. I've no concerns regarding power unless it'll cost me an extra 100 bucks a month..

Ideas? I posted quite some time ago in preparation but now I'm ready to make a decision and the hardware landscape has changed a bit.

 

[Sparkyy]

Haven't played with WHS or FreeNAS but I saw that FreeNAS, besides being free, is perfectly able to back up both Macs and PCs, plus it can run on lesser hardware than WHS.