Is it really so hard to just put your OS and apps on an SSD drive and keep your big media files on a regular HDD? Unlike a disk, I can predict with 100% accuracy what data seek times will matter for.
I bought a $2,000 laptop from Dell a few months ago with a 128 GB SSD and 500 GB Big Dumb Drive. Guess which one had Windows installed on it when it arrived. grumble grumble Scratch one day.
SSDs come in form factors other than 2.5" laptop drives. Most of that space is just air. My eeepc had one in a mini-PCI-E form factor. If you can fit a 3G card in something, you can fit a pretty big SSD in, too.
Thats exacty what I did. But my SSD is an older one, so doing disk intensive things like Windows Update can make the whole system sluggish (mainly the system restore points I guess).