Apple memory remains expensive, for more on that topic, see my Jan 28 entry.
And Apple does not offer a 16GB option for the MacBook Pro, so get the minimum from Apple, and save a bundle with OWC memory.
Click the graphs to see current memory prices.
A 16GB kit now starts to look more feasible for power users than it did a few months ago. It is also possible to go with 12GB memory as one 8GB module and one 4GB module.