I have a 15" MacBook Pro with a 250gb hard drive and 2gb of RAM. I have only 7gb of space left and have been considering getting a time capsule to use as my main hard drive, due to never taking my laptop out of the house and streaming everything over my network. I have been advised that it would be cheaper to just upgrade my hard drive. So, would this be possible: Would i be able to replace my existing hard drive with a Western Digital Scorpio Blue 1TB 2.5" SATA-300 5200rpm 8MB? and would i need more RAM? Is this easy to do?