I have the same MBP (2.0GHz Core i7). I bumped the memory up to 16GB, which helps in certain applications. When I replaced the original hard drive with an SSD, though, that made a massive difference. It felt like a new computer. Startup, shutdown and application loading was nearly instant.
For reference, I took out the DVD drive, moved that to an external USB enclosure, and then used a special bracket to re-use the original hard drive in the DVD drive bay, and set the 256GB SSD as my new primary drive. I keep my iPhoto library and iTunes library on the hard drive, and most everything else on the SSD. This was the best money I ever spent on a computer upgrade...