I've been following MR for a while now, so I figured I may as well join the forums and ask a question. I've got a late 2011 MacBook Pro 15" at home, which I treat essentially as a desktop at this point. It still has a stock 5400 RPM 500 GB HDD in it, and I was considering replacing the optical drive with an SSD to use as the boot disk. I've been thinking about just replacing the computer for a while now, but budget is tight, and an SSD might get me the performance boost I want. My question is - is it worth investing $150-$200 in putting in a 500 GB SSD, or is the machine old enough that I'd be better off saving for a replacement? I'd love to see a new Mac Mini this year (love the headless design), but could also see myself getting an iMac if/when I can afford one.