no matter what you do, make sure you order for a good store. that is good with RAM just in case you get some bad RAM.
--
you don't have to buy name brand, but for such a large purchase, it's the best way to go, especially if it's for work.
i recommend crucial since you are ordering straight from the manufacturer (sorta, it's still a store front, but they make the RAM, crucial is owned by micron).
--
and call the store, ask if you can get any special discounts ;-)