FWIW, some SSDs come bundled with software that make it easy to migrate your existing Windows installation from your OEM installed drive. I ordered a Crucial SSD for work a year or so ago, and it came bundled with a license for Acronis True Image HD. The software is wizard driven and made it easy to clone my platter drive to the solid state, despite the fact that the drives are different capacity. It handled resizing the partitions automatically, and after switching the cables on the two drives I was immediately able to boot to SSD and format the platter drive to use as a destination for Windows Backup / shadow copies.
Here's another tip. Go with the largest capacity you can. The larger the capacity, the longer the drive will last. Solid state drives have a finite amount of writes they can perform for each chunk of space before wearing out. The drive ought to be able to manage its writes so that they occur sequentially from the beginning to the end of free space as needed, then start over so that it wears evenly. The larger the drive, the longer it will take to loop back to the beginning.
See this page for more info and useful SSD tips.