OP - First of all, best of luck on the "experiment". Secondly, don't age IPA's!! Also, a "high ABV malty brown ale" is probably not worth aging, bu that's just my opinion. Bottle conditioned beers are a good idea....imperial stouts, barleywines, strong ales are good choices as well. I'm going to guess you're not into Belgians or Lambics, Saisons and Wild Ales, but all of those are great to cellar as well. My advice would be to try as many new beers as possible to see what you like and then age those to see the difference over time. For example, cellar a few bottles of this years release to try alongside next years so you can compare/contrast. My advice would be to have a set amount ($100 or something) you drop each month on your cellar...don't drink any of the beers...and BOOM...one year from now you got $1,200 of dank brews and all your friends are hounding you about the next tasting party!
Given your locale, here are my recs for beer to start aging. I have aged all of these beers at one point or another to various degrees of success:
Goose Island - Bourbon County Brand Stout (and all the variants).
Bell's - Expedition Imperial Stout, Black Note, Third Coast Old Ale (this is a greatly underrated beer imo)
Founders - KBS, Imperial Stout,
Firestone Walker - Anniversary Ale (XVII, etc.), Sucaba, Parabola,
Great Lakes - Blackout Stout
Stone - Imperial Russian Stout, Double Bastard
Three Floyds - Behemoth, Dark Lord
Oskar Blues - Ten Fidy
Surly - Darkness (available in CHI I think now).
Pipeworks, Revolution, Central Waters, Jolly Pumpkin & lots of other Michigan/Wisconsin breweries have good beer to age as well.
Best of luck. Remember, It's an experiment!!! YMMV