Not so much the case anymore. Most higher end consumer routers are extremely easy to install custom firmware on (Linksys, ASUS, Buffalo, Belkin, etc). The days of multiple hardware revisions and "Do this right or you'll brick your router forever" are mostly exaggerated.
Mikrotik doesn't seem to sell any 5Ghz routers though. Access points sure, but no consumer friendly single devices.
Shibby also has an ARM build of Tomato for the RT-AC68U. Haven't tried it myself, but it's gone through a number of revisions and should be good to go.
Why do you need N? Because it's faster, a lot faster. That should be reason enough for most Slashdot readers.
Now who can tell me were to find a mini pci-express card that'll do 1900mbps?
Gotta agree. My RT-N66U(Shibby 121) is running a crap load of stuff with zero downtime. VLAN, IPTV, VoIP, OpenVPN server and client, Print server, etc etc etc.
I've got an RT-AC68U as my access point. Not as mature firmware wise, and hard to test to it's full potential, but rock solid none the less.
ASUS can shut up and take my money.
Of the Nexus One (2010-01), Nexus S (2010-12), and Galaxy Nexus (2011-11), which can run Android 4.4 (KitKat)? Nexus One is stuck on 2.3 (Gingerbread), Nexus S on 4.1 (Jelly Bean), and Galaxy Nexus on 4.2 (Jelly Bean 2) or 4.3 (Jelly Bean 3) depending on revision.
True enough, however, if I REALLY wanted my old Android device (Nexus S for example) to run a newer version of Android, it COULD be done. Root the phone and load Cyanogen or something. With an iPad, from my knowledge, you're pretty much SOL.