If you find yourself with lots of beachballs (these appear when the system is working hard to process something), then you can always add RAM or the SSD later. RAM is the cheapest, but it doesn't seem like you would benefit as much from it as from SSD. However, unless you have a lot of money to burn, it doesn't sound like you need to upgrade with either. The MacBook Pro is pretty powerful. Given what you do, you may never even see a beachball
Transferring files is very easy. Put them onto some kind of device (a flash drive or external HD if you buy it) and copy them to your Mac. Your Mac can read an external hard drive formatted for Windows (the labels on the box tell you which operating system it is made for), but because of format issues, cannot write anything on it. Once you have everything transfered, open up the application "TimeMachine" and it will format the disk (destroying everything on it in the process) for your backup. Then, you are all set! If go through this process, remember to buy the external hard drive that is formatted for Windows, because you need your Windows machine to be able to copy the files onto the drive for the transfer.
Sometimes the transition from Windows to Mac can be difficult. Things are really frustrating, in fact. Double-clicking is a difficult habit to break! But, once you get used to where things are and how they work, you should be fine.
Apple stores often provide assistance in this regard. I highly recommend you go check out the Genius Bar. A few minutes there can help you get the most out of your new computer.
http://www.apple.com/retail/geniusbar/
Great info.. Thx so much