thanks for your input,
I already bought the bitfenix prodigy, so can't really change to micro-atx. The case seems to fit the bill as it's reasonably portable, low priced and can fit a several HDD's. I think it'll have better airflow that some of the other smaller itx cases (i agree this case is micro-atx sized). Still overall small though.
Apart from cost I don't see any real advantages to go micro atx route, and the itx boards available are pretty much fully featured which is quite amazing given how small they are.
But how is raid not backup? A HDD can just die and if you only have one you do lose all of your files. What are the chances of 3 drives all dying at the same time? As for viruses etc, the OS is going to run on an SSD anyway. Accidental file deletion is an issue, but often files can be recovered from mechanical HDD's quite easily if quick action is taken, and really it just takes diligence on part of the user not to delete the wrong files. You can't 'idiot proof ' a system completely.
I also have a spare i5 2500k, so to save costs i'm going to put that in and give it a 4.5 overclock, sandybridge runs cooler than ivy when overclocked anyway and I have a spare aftermarket heatsink too that'll fit in this micro-atx sized case without issue. Not necessary at all, but why not lol? It means the rig won't be 'slow' for many, many years to come given its non-gaming purpose. The price different between H77 and Z77 wasn't really a deal breaker so I went with asrock z77, which comes with wifi, good audio etc.
Should turn out to be a solid little rig that'll last a good 4 or 5 years. I'll enjoy this build... I currently have a massive/heavy wc rig, but I'm tempted to make my 2013 haswell build itx too, since i never sli anyway and my current rig is just not portable at all.
I guess that depends on what lineup of itx boards become available for haswell, but the form factor is gaining in popularity so i'm sure there'll be some good ones.