Memory Upgrade that help computers perform

I have a desktop PC at home that I had put together with my brother a few years back and recently I wanted to get one for my own. I decided to get a portable computer since it is suitable for my needs. But what kind should I get? With all the options you can choose from I had a hard time choosing one that I like. I went online to research on the best one out in the market. One of the things that I look for in a laptop is the computer memory or Dell laptop memory should be upgradable. I usually go to sites like MemoryUpgrade.com that accommodates well known computer brands like Dell and Apple Apple memory to see the best memory upgrade they could offer for my price range. I checked benchmarking reviews on various brands to see their performance. I got excited on a few models with their add-ons and special features. But after a long and careful deliberation, you are now looking at a proud owner of a new Dell computer.