I keep mine outside as well, for reasons already mentioned, especially the extra room inside.
I got a sweet deal on my tank, bought a guys old used equipment, tank was out of cert by 10 years, swapped it for a one year old steel one for $20 exchange. When that emptied I found a place to swap and got a 1 year old aluminum tank for $15 exchange yay! I am going to try to get this one filled since I like the aluminum (no rust rings).
"People should not be afraid of their governments. Governments should be afraid of their people." - V
Secondary: Shady Lord RIS, Water to Barleywine, Pumpkin wine, burnt mead
Kegged: Crappy infected mild
Bottles: Apfelwein, 999 Barleywine, Oatmeal Stout, Robust Porter, Robust smoked porter, Simcoe Smash