Why? So this sp33d fr3@k can sit around and twittle his thumbs while the world passes him by? I don't think so
OP, since you have cash to burn (a good thing when considering Apple anything) , ditch the x25-m. Take out the superdrive and put it in an external enclosure. Replace that with the 500 gb 5200 rpm drive (or any other 7200 rpm drive) for media, then get the x25-E 64Gb.
If you want extreme extreme outrageousness, take out the superdrive as stated earlier, but get two x25-m's or x25-e's in a raid 0 config with a decent backup schema.
How is a 7,200 rpm drive really slow??