I think the correct answer is to brew new beers so often that you don't have a chance to finish a batch before the next one is ready.
Seriously, though, what's the harm in storing a few bottles away? If you're doing at least 5 gallon batches, that's such a small percentage of the batch. And even if it doesn't age well, you will have learned something without wasting too much money/effort.
If you need me, I'll be out behind the woodshed pounding Grolsches.
Primary: Maris Otter/EKG SMaSH
Bottle: Deizbeutzervet Dunkelweizen
Keg: Independence Day Strawberry Blonde
Keg: Munich/Mt. Hood SMaSH