hm. confused, Since everything is in my hdd right now, can't I use both? like the ssd for OSX and win 7, while the hdd is for files and such?
Yes. You kind of rephrased what I said.
To install the SSD, you're going to have to take something out.
If you're like me, you pull the old HDD and install the SSD in the newly emptied space. If you're not me, you would probably pull the optical drive and use that space to install the SSD using a caddy.