Cassie,
Do note that the 'fatter' bottles known as the Burgundy shape will not fit nicely together in standard empty cases or some wine racks. As Scuba noted, great straight-sided Bordeaux bottles stack really well, and bottle shape/size uniformity is a great thing for most wine storage methods.
The wine is going to taste the same regardless of the shape of the bottle in which you store it. If you happen to label your Chardonnay as a Riesling, however, that may cause some confusion later on.
- Jim