I still mainly work using a 2008 unibody aluminium 13" Macbook. It's getting a bit old but it has the 2.4GHz processor, 8GB of RAM and on the whole still works really well for what I do most of the time. About a year ago I replaced the 250GB HD in it for a 256GB SSD from Crucial. This improved the machines performance and convinced me my little baby still had plenty of life left in it.
The main problem with a 256GB SSD is that it is only 256GB. For the last 9 months I have also been using a 2.5" external HD to store all non essential stuff as the main SSD is rather full. Carrying an external drive with you is never great and I have been meaning to do something about this for a while but never got around to it.
Last week the Superdrive in my wife's Macbook failed. After getting some ridiculous quote from the Apple store to replace it I decided that I very rarely use the superdrive in my Macbook and it might be a good idea to take it out , put it in my wife's machine and put a second HD into mine.
So I ordered a Seagate 750GB 2.5 inch SATA-II Momentus Hard Drive - 7200RPM 16MB Cache - ST9750420AS and an HDCaddy to hold it in the superdrive bay.
Fitting the whole thing was pretty easy and I could have probably worked it all out myself but it's always better to get advice from someone who has done it before so I followed a YouTube video called Macbook 13" Unibody Disassembly Repair - Superdrive CD Drive Removal from Powerbook Medic
So now my 4 year old MacBook has 1TB of internal storage and is running fine. I will probably replace it in the next year but I am waiting to see what Apple does with the next round of MacBook Pros. Internal storage is important to me. The last 9 months using an external drive has been a real pain so if the next incarnation of the MacBook Pros end up moving to just SSD I might find myself buying a current generation 15" model in order to keep my storage inside the machine.