Pellet hops cost less and are better utilized (debatable) during dry hopping. That said I like using the whole hops in the secondary. I make a "hop tea". Search it here on HBT and here
They do like kinda gross during the dry hop though. Whole hops is definitely prettier.
If I use whole hops I try to brew a 6 gal batch. So when I switch to secondary I get about 5.5 gals. This fills my 5 gal glass (actually holds 5.5 gal) perfectly forcing the whole hops to be "submerged" in the top of the carboy.
You'll get good effects from 2 oz no matter what you do I'm sure.