Unless you really are concerned about some sort of heat wave coming through, go for the lager yeast. Thrill and adventure is half the fun of homebrewing.
Keeping that temperature within lager yeast temperatures really is only critical for a week or two, while the active fermentation is over. After that, you don't have to worry about esters, fusels, acetaldehyde, and all those other funky things that you don't want from lager yeasts.
Beer is good for anything from hot dogs to heartache.
Drinking Frog Brewery, est. 1993