aha, good to hear others think its just a huge fad and waste of money!
I never bothered to delve into the reasons why the N1 crashes so much but its interesting to see why!
As for you choice, i picked exactly the same parts and saved the linitx basket. waiting for my next student loan to role round in a week or so to take the plunge.
For the other parts i was going to source out an old cheapo laptop or desktop hard drive; as the space doesn't have to be huge to support pfsense and I'm not doing anything that's hard drive intensive. Regarding heat, i don't think it would be to high within the case to warrant needing a fan to cool down the HDD, but depending or placement a tiny one would probably help all round.
Wifi you can get on the board from what i've read by using a mini-PCIE card with external antenna connectors and using it in G mode for the time being until fully supported? plus the N1 as a backup.
MY plan was to use any provide holes to mount the screw connectors, or use a drill to widen or create new points on the top of the case, tho i was ideally trying to find a tri antenna mini-PCI card
Hope this helps, and i will defiantly be updating when i get this build going !